Compounds

ABSTRACT

The present invention relates to compounds of formula (I) 
     
       
         
         
             
             
         
       
     
     and to compositions comprising the same and to the use of the compounds and their compositions in treatment, for example in the treatment of inflammatory diseases, in particular respiratory inflammatory disease. The invention also extends to methods of making said compounds.

FIELD OF THE INVENTION

The invention relates to compounds which are inhibitors ofphosphoinositide 3-kinases, (PI3 kinases). In particular the inventionrelates to compounds that inhibit the PI3 kinase delta sub-type andoptionally, in addition, the gamma and alpha sub-types thereof, andtheir use in therapy, including in pharmaceutical combinations,especially in the treatment of inflammatory diseases, includinginflammatory diseases of the lung, such as COPD and asthma. Thedisclosure also extends to methods of preparing said compounds andpharmaceutical compositions comprising same.

BACKGROUND OF THE INVENTION

Lipid kinases catalyse the phosphorylation of lipids to produce speciesinvolved in the regulation of a wide range of physiological processes,including cellular migration and adhesion. The PI3-kinases belong tothis class of enzymes and are membrane associated proteins whichcatalyse the phosphorylation of lipids which are themselves associatedwith cell membranes. The PI3-kinase delta (δ) isozyme (PI3 kinase δ) isone of four isoforms of type I PI3 kinases responsible for generatingvarious 3′-phosphorylated phosphoinositides, that mediate cellularsignalling and have been implicated in a number of cellular processessuch as inflammation, growth factor signalling, malignant transformationand immunity (See Review by Rameh, L. E. and Cantley, L. C. J. Biol.Chem., 1999, 274:8347-8350).

Involvement of PI3 kinases in controlling inflammation has beenconfirmed in several models using pan-PI3 kinase inhibitors, such asLY-294002 and wortmannin (Ito, K. et al., J Pharmacol. Exp. Ther., 2007,321:1-8). Recent studies have been conducted using either selective PI3kinase inhibitors or in knock-out mice lacking a specific enzymeisoform. These studies have demonstrated the role of the pathwayscontrolled by PI3 kinase enzymes in inflammation. The PI3 kinase δselective inhibitor IC-87114 was found to inhibit airwayhyper-responsiveness, IgE release, pro-inflammatory cytokine expression,inflammatory cell accumulation into the lung and vascular permeabilityin ovalbumin-sensitized, ovalbumin-challenged mice [Lee, K. S. et al.,J. Allergy Clin. Immunol., 2006, 118:403-409 and Lee, K. S. et al.,FASEB J., 2006, 20:455-65]. In addition, IC-87114 lowered neutrophilaccumulation in the lungs of mice and neutrophil function, stimulated byTNFα [Sadhu, C. et al., Biochem. Biophys. Res. Commun., 2003,308:764-9]. The PI3 kinase δ isoform is activated by insulin and othergrowth factors, as well as G-protein coupled protein signaling andinflammatory cytokines. Recently the PI3 kinase dual δ/γ inhibitorTG100-115 was reported to inhibit pulmonary eosinophilia, interleukin-13as well as mucin accumulation and airways hyperesponsiveness in a murinemodel, when administered by aerosolisation. The same authors alsoreported that the compound was able to inhibit pulmonary neutrophiliaelicited by either LPS or cigarette smoke [Doukas, J. et al., JPharmacol. Exp. Ther., 2009, 328:758-765]

Since it is also activated by oxidative stress, the PI3 kinase δ isoformis likely to be relevant as a target for therapeutic intervention inthose diseases where a high level of oxidative stress is implicated.Downstream mediators of the PI3 kinase signal transduction pathwayinclude Akt (a serine/threonine protein kinase) and the mammalian targetof rapamycin, the enzyme mTOR. Recent work has suggested that activationof PI3 kinase δ, leading to phosphorylation of Akt, is able to induce astate of corticosteroid resistance in otherwise corticosteroid-sensitivecells [To, Y. et al., Am. J. Respir. Crit. Care Med., 2010,182:897-904]. These observations have led to the hypothesis that thissignalling cascade could be one mechanism responsible for thecorticosteroid-insensitivity of inflammation observed in the lungs ofpatients suffering from COPD, as well as those asthmatics who smoke,thereby subjecting their lungs to increased oxidative stress. Indeed,theophylline, a compound used in the treatment of both COPD and asthma,has been suggested to reverse steroid insensitivity through mechanismsinvolving interaction with pathways controlled by PI3 kinase δ [To, Y.et al., Am. J. Respir. Crit. Care Med., 2010, 182:897-904].

At present the mainstay of treatment for both asthma and COPD is inhaledtherapy, using a combination of corticosteroids, muscarinic antagonistsand β₂-agonists, as judged clinically appropriate. One way of addressingthe unmet medical needs in COPD and asthma is to identify newtherapeutic agents, for example suitable for use as inhaled medicines,which have the potential to provide significant benefit when used as amonotherapy or in combination with one or more medicaments from thesethree pharmacological classes. Therefore, there remains a need toidentify and develop isoform selective PI3 kinase inhibitors which havethe potential to provide enhanced therapeutic efficacy in asthma, COPDand other inflammatory diseases.

SUMMARY OF THE INVENTION

According to the invention, there is provided a compound of formula (I):

wherein

-   R¹ is H, a saturated or unsaturated, branched or unbranched C₁₋₁₅    alkyl chain, wherein optionally one or more carbons (for example 1,    2 or 3 carbons, suitably 1 or 2, in particular 1) is/are replaced by    a heteroatom selected from O, N, S(O)_(p), (for example a CH₂, group    is replaced with O, or with NH, or with S, or with SO₂ or a —CH₃    group at the terminus of the chain or on a branch is replaced with    OH or with NH₂) wherein said chain is optionally substituted by one    or more groups (for example 1 to 3, such as 2 groups) independently    selected from oxo, halogen, an aryl group, a heteroaryl group, a    carbocyclyl group or a heterocyclyl group,    -   each aryl, heteroaryl, carbocyclyl or heterocyclyl group        bearing:    -   0 to 3 substituents selected from halogen, -hydroxyl, —C₁₋₆        alkyl, —C₁₋₆ alkoxy, —C₂₋₃ alkoxyOC₁₋₃ alkyl, —C₂₋₃ alkylOC₁₋₃        alkyl, —C₁₋₃ hydroxyalkyl, —C₁₋₆ haloalkyl, amino, —C₁₋₄ mono or        —C₂₋₈ di-alkyl amino, —C₁₋₄ mono or —C₂₋₈ di-acyl amino, —C₀₋₆        alkylS(O)_(p)C₁₋₆ alkyl, —C₀₋₆ alkylS(O)_(p)NR⁸R⁷, —C₀₋₆        alkylNR⁸C₀₋₆alkylS(O)_(p)C₁₋₆ alkyl, —C₀₋₆ alkylC(O)OC₀₋₆ alkyl,        —NR⁸C₀₋₆ alkylC(O)NR⁶R⁷—NR⁸C₀₋₆ alkylC(O)C₀₋₆ alkyl, —C₀₋₆        alkylC(O)NR⁶R⁷, and —C₀₋₆ alkylC(O)C₁₋₆ alkyl; and/or one aryl,        heterocyclyl or carbocyclyl;-   X is C₆₋₁₀ aryl or a C₅₋₉ heteroaryl each substituted by R^(2a) and    by R^(2b)    -   wherein R^(2a) is selected from hydrogen, —C₁₋₃ alkyl, halo,        hydroxyl, cyano, —C₁₋₃ haloalkyl, —C₁₋₃ alkoxy, —C₂₋₃        alkoxyOC₁₋₃ alkyl, —C₂₋₃ alkylOC₁₋₃ alkyl, —C₁₋₃ hydroxyalkyl,        —C₀₋₆ alkylS(O)_(q)C₁₋₃ alkyl, —C₀₋₆ alkylS(O)_(p)NR⁸R⁷, —C₀₋₆        alkylNR⁸C₀₋₆alkylS(O)_(p)C₁₋₆ alkyl, —C₀₋₆ alkylC(O)OH, —C₀₋₆        alkylC(O)OC₁₋₆ alkyl, —NR⁸C₀₋₆ alkylC(O)NR⁶R⁷, —NR⁸C₀₋₆        alkylC(O)C₁₋₆ alkyl, —C₀₋₆ alkylC(O)NR⁶R⁷ and —C₀₋₆        alkylC(O)C₁₋₆ alkyl; and    -   R^(2b) is selected from hydrogen, C₁₋₃ alkyl, halo, hydroxyl,        cyano, —C₁₋₃ haloalkyl, —C₁₋₃ alkoxy, and —C₀₋₆        alkylS(O)_(q)C₁₋₃ alkyl;-   R^(3a) is hydroxyl;-   R^(3b) is selected from hydrogen, hydroxyl, halo, cyano, —C₁₋₃    haloalkyl, —C₁₋₃ hydroxyalkyl, —C₁₋₃ alkoxy, and —S(O)_(q)C₁₋₃    alkyl;-   R⁴ is hydrogen or —C₁₋₃ alkyl;-   R⁵ is hydrogen or —C₁₋₃ alkyl;-   R⁶ is hydrogen or —C₁₋₆ alkyl;-   R⁷ is hydrogen or —C₁₋₆ alkyl;-   R⁸ is hydrogen or —C₁₋₆ alkyl;-   p is 0 or an integer 1 or 2;-   q is 0 or an integer 1 or 2    or a pharmaceutically acceptable salt thereof, including all    stereoisomers, tautomers and isotopic derivatives thereof.

In one embodiment R¹ is H, a saturated or unsaturated, branched orunbranched C₁₋₁₂ alkyl chain, wherein optionally one or more carbons(for example 1, 2 or 3 carbons, suitably 1 or 2, in particular 1) is/arereplaced by a heteroatom selected from O, N, S(O)_(p), (for example aCH₂, group is replaced with O, or with NH, or with S, or with SO₂ or a—CH₃ group at the terminus of the chain or on a branch is replaced withOH or with NH₂) wherein said chain is optionally substituted by one ormore groups (for example 1 to 3, such as 2 groups) independentlyselected from oxo, halogen, an aryl group, a heteroaryl group, acarbocyclyl group or a heterocyclyl group,

-   -   each aryl, heteroaryl, carbocyclyl or heterocyclyl group        bearing:    -   0 to 3 substituents selected from halogen, hydroxyl, —C₁₋₆        alkyl, —C₁₋₆ alkoxy, —C₂₋₃ alkylOC₁₋₃ alkyl, —C₂₋₃ alkoxyOC₁₋₃        alkyl, —C₁₋₃ hydroxyalkyl, —C₁₋₆ haloalkyl, amino, —C₁₋₄ mono or        —C₂₋₈ di-alkyl amino, —C₁₋₄ mono or —C₂₋₈ di-acyl amino, —C₀₋₆        alkylS(O)_(p)C₁₋₆ alkyl, —C₀₋₆ alkylS(O)_(p)NR⁶R⁷, —C₀₋₆        alkylNR⁸C₀₋₆alkylS(O)_(p)C₁₋₆ alkyl, —C₀₋₆ alkylC(O)OC₀₋₆ alkyl,        —NR⁸C₀₋₆ alkylC(O)NR⁶R⁷—NR⁸C₀₋₆ alkylC(O)C₀₋₆ alkyl, —C₀₋₆        alkylC(O)NR⁶R⁷, and —C₀₋₆ alkylC(O)C₁₋₆ alkyl; and/or one aryl,        heterocyclyl or carbocyclyl.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows chiral stationary phase HPLC analysis of PIK294

FIG. 2 shows preparative chiral HPLC separation of the atropisomers ofPIK294

FIG. 3 shows N-3 aryl quinazolinones separated into atropisomers bychiral HPLC

FIG. 4 shows Inhibition of LPS-induced neutrophilia in the mouse by thecompound of Example 1.

FIG. 5 shows inhibition by the compound of Example 1 of cigarettesmoke-induced pulmonary macrophage and neutrophil influx in the mouse

DETAILED DESCRIPTION

In one embodiment there is provided a compound of formula (I)

wherein

-   R¹ is H, a saturated or unsaturated, branched or unbranched C₁₋₁₀    alkyl chain, wherein optionally one or more carbons (for example 1,    2 or 3 carbons, suitably 1 or 2, in particular 1) is/are replaced by    a heteroatom selected from O, N, S(O)_(p), (for example a CH₂, group    is replaced with O, or with NH, or with S, or with SO₂ or a CH₃    group at the terminus of the chain or on a branch is replaced with    OH or with NH₂) wherein said chain is optionally substituted by one    or more groups (for example 1 to 3, such as 2 groups) independently    selected from oxo, halogen, an aryl group, a heteroaryl group, a    carbocyclyl group or a heterocyclyl group,    -   each aryl, heteroaryl, carbocyclyl or heterocyclyl group        bearing:        -   0 to 3 substituents selected from halogen, —C₁₋₆ alkyl,            —C₁₋₆ alkoxy, —C₂₋₃ alkoxyOC₁₋₃ alkyl, —C₁₋₆ haloalkyl,            amino, —C₁₋₄ mono or —C₂₋₈ di-alkyl amino, —C₁₋₄ mono or            —C₂₋₈ di-acyl amino, —C₀₋₆ alkylS(O)_(p)C₁₋₆ alkyl, —C₀₋₆            alkylS(O)_(p)NR⁶R⁷, —C₀₋₆ alkylNR⁸C₀₋₆alkylS(O)_(p)C₁₋₆            alkyl, —C₀₋₆ alkylC(O)OC₀₋₆ alkyl, —NC₀₋₆ alkylC(O)NR⁶R⁷            alkylC(O)C₀₋₆ alkyl, —C₀₋₆ alkylC(O)NR⁶R⁷, and —C₀₋₆            alkylC(O)C₁₋₆ alkyl; and/or one aryl, heterocyclyl or            carbocyclyl;-   X is C₆₋₁₀ aryl or a C₆₋₉ heteroaryl each substituted by R^(2a) and    optionally by R^(2b) wherein R^(2a) is hydrogen, —C₁₋₃ alkyl, halo,    hydroxyl, cyano, —C₁₋₃ haloalkyl, —C₁₋₃ alkoxy, —C₂₋₃ alkoxyOC₁₋₃    alkyl, —C₁₋₃ hydroxyalkyl, —C₀₋₆ alkylS(O)_(q)C₁₋₃ alkyl, —C₀₋₆    alkylS(O)_(p)NR⁶R⁷, —C₀₋₆ alkylNR⁸C₀₋₆ alkylS(O)_(p)C₁₋₆ alkyl,    —C₀₋₆ alkylC(O)OH, —C₀₋₆ alkylC(O)OC₁₋₆ alkyl, —NC₀₋₆    alkylC(O)NR⁶R⁷, —NR⁸C₀₋₆ alkylC(O)C₁₋₆ alkyl, —C₀₋₆ alkylC(O)NR⁶R⁷    and —C₀₋₆ alkylC(O)C₁₋₆ alkyl; and    -   R^(2b) is hydrogen, C₁₋₃ alkyl, halo, cyano, —C₁₋₃ haloalkyl,        —C₁₋₃ alkoxy, —C₀₋₆ alkylS(O)_(q)C₁₋₃ alkyl;-   R^(3a) is hydroxyl;-   R^(3b) is hydrogen, hydroxyl, halo, cyano, —C₁₋₃ haloalkyl, —C₁₋₃    hydroxyalkyl, —C₁₋₃ alkoxy, —S(O)_(q)C₁₋₃ alkyl;-   R⁴ is hydrogen or —C₁₋₃ alkyl;-   R⁵ is hydrogen or —C₁₋₃ alkyl;-   R⁶ is hydrogen or —C₁₋₆ alkyl;-   R⁷ is hydrogen or —C₁₋₆ alkyl;-   R⁸ is hydrogen or —C₁₆ alkyl;-   p is 0 or an integer 1 or 2;-   q is 0 or an integer 1 or 2    or a pharmaceutically acceptable salt thereof, including all    stereoisomers, tautomers and isotopic derivatives thereof.

In one embodiment the present disclosure provides a compound of formula(IA′):

-   -   R¹ is H, a saturated or unsaturated, branched or unbranched        C₁₋₁₅ alkyl chain, wherein optionally one or more carbons (for        example 1, 2 or 3 carbons, suitably 1 or 2, in particular 1)        is/are replaced by a heteroatom selected from O, N, S(O)_(p),        (for example a CH₂, group is replaced with O, or with NH, or        with S, or with SO₂ or a CH₃ group at the terminus of the chain        or on a branch is replaced with OH or with NH₂) wherein said        chain is optionally substituted by one or more groups (for        example 1 to 3, such as 2 groups) independently selected from        oxo, halogen, an aryl group, a heteroaryl group, a carbocyclyl        group or a heterocyclyl group,    -   each aryl, heteroaryl, carbocyclyl or heterocyclyl group        bearing:    -   0 to 3 substituents selected from halogen, -hydroxyl, —C₁₋₆        alkyl, —C₁₋₆ alkoxy, —C₂₋₃ alkoxyOC₁₋₃ alkyl, —C₂₋₃ alkylOC₁₋₃        alkyl, —C₁₋₃ hydroxyalkyl, —C₁₋₆ haloalkyl, amino, —C₁₋₄ mono or        —C₂₋₈ di-alkyl amino, —C₁₋₄ mono or —C₂₋₈ di-acyl amino, —C₀₋₆        alkylS(O)_(p)C₁₋₆ alkyl, —C₀₋₆ alkylS(O)_(p)NR⁶R⁷, —C₀₋₆        alkylNR⁸C₀₋₆alkylS(O)_(p)C₁₋₆ alkyl, —C₀₋₆ alkylC(O)OC₀₋₆ alkyl,        —NR⁸C₀₋₆ alkylC(O)NR⁶R⁷—NR⁸C₀₋₆ alkylC(O)C₀₋₆ alkyl, —C₀₋₆        alkylC(O)NR⁶R⁷, and —C₀₋₆ alkylC(O)C₁₋₆ alkyl; and/or one aryl,        heterocyclyl or carbocyclyl;

-   R^(2a) is hydrogen, —C₁₋₃ alkyl, halo, hydroxyl, cyano, —C₁₋₃    haloalkyl, —C₁₋₃ alkoxy, —C₂₋₃ alkoxyOC₁₋₃ alkyl, —C₁₋₃    hydroxyalkyl, —C₀₋₆ alkylS(O)_(q)C₁₋₃ alkyl, —C₀₋₆    alkylS(O)_(p)NR⁶R⁷, —C₀₋₆ alkylNR⁸C₀₋₆ alkylS(O)_(p)C₁₋₆ alkyl,    —C₀₋₆ alkylC(O)OH, —C₀₋₆ alkylC(O)OC₁₋₆ alkyl, —NC₀₋₆    alkylC(O)NR⁶R⁷, —NR⁸C₀₋₆ alkylC(O)C₁₋₆ alkyl, —C₀₋₆ alkylC(O)NR⁶R⁷    and —C₀₋₆ alkylC(O)C₁₋₆ alkyl;

-   R^(2b) is hydrogen, C₁₋₃ alkyl, halo, cyano, C₁₋₃ haloalkyl, C₁₋₃    alkoxy, C₀₋₆ alkylS(O)_(q)C₁₋₃ alkyl;

-   R^(3a) is hydroxyl;

-   R^(3b) is hydrogen, hydroxyl, halo, cyano, C₁₋₃ haloalkyl, C₁₋₃    hydroxyalkyl, C₁₋₃ alkoxy, S(O)_(q)C₁₋₃ alkyl;

-   R⁴ is hydrogen or —C₁₋₃ alkyl;

-   R⁵ is hydrogen or —C₁₋₃ alkyl;

-   R⁶ is hydrogen or —C₁₋₆ alkyl;

-   R⁷ is hydrogen or —C₁₋₆ alkyl;

-   R⁸ is hydrogen or —C₁₆ alkyl;

-   p is 0 or an integer 1 or 2;

-   q is 0 or an integer 1 or 2    or a pharmaceutically acceptable salt thereof, including all    stereoisomers, tautomers and isotopic derivatives thereof.

In one embodiment the present disclosure provides a compound of formula(IA):

-   -   R¹ is H, a saturated or unsaturated, branched or unbranched        C₁₋₁₅ alkyl chain (such as a C₁₋₁₂ alkyl chain or a C₁₋₁₀ alkyl        chain), wherein optionally one or more carbons (for example 1, 2        or 3 carbons, suitably 1 or 2, in particular 1) is/are replaced        by a heteroatom selected from O, N, S(O)_(p), (for example a        CH₂, group is replaced with O, or with NH, or with S, or with        SO₂ or a CH₃ group at the terminus of the chain or on a branch        is replaced with OH or with NH₂) wherein said chain is        optionally substituted by one or more groups independently        selected from oxo, halogen, an aryl group, a heteroaryl group, a        carbocyclyl group or a heterocyclyl group    -   each aryl, heteroaryl, carbocyclyl or heterocyclyl group        bearing:        -   0 to 3 substituents selected from halogen, —C₁₋₆ alkyl,            —C₁₋₆ alkoxy, —C₂₋₃ alkoxyOC₁₋₃ alkyl, —C₁₋₆ haloalkyl,            amino, —C₁₋₄ mono or —C₂₋₈ di-alkyl amino, —C₁₋₄ mono or            —C₂₋₈ di-acyl amino, —C₀₋₆ alkylS(O)_(p)C₁₋₆ alkyl, —C₀₋₆            alkylS(O)_(p)NR⁶R⁷, —C₀₋₆ alkylNR⁸C₀₋₆alkylS(O)_(p)C₁₋₆            alkyl, —C₀₋₆ alkylC(O)OC₀₋₆ alkyl, —NC₀₋₆            alkylC(O)NR⁶R⁷—NC₀₋₆ alkylC(O)C₀₋₆ alkyl, —C₀₋₆            alkylC(O)NR⁶R⁷, and —C₀₋₆ alkylC(O)C₁₋₆ alkyl; and/or one            aryl, heterocyclyl or carbocyclyl;

-   R^(2a) is hydrogen, —C₁₋₃ alkyl, halo, hydroxyl, cyano, —C₁₋₃    haloalkyl, —C₁₋₃ alkoxy, —C₂₋₃ alkoxyOC₁₋₃ alkyl, —C₁₋₃    hydroxyalkyl, —C₀₋₆ alkylS(O)_(q)C₁₋₃ alkyl, —C₀₋₆    alkylS(O)_(p)NR⁶R⁷, —C₀₋₆ alkylNR⁸C₀₋₆ alkylS(O)_(p)C₁₋₆ alkyl,    —C₀₋₆ alkylC(O)OH, —C₀₋₆ alkylC(O)OC₁₋₆ alkyl, —NC₀₋₆    alkylC(O)NR⁶R⁷, —NR⁸C₀₋₆ alkylC(O)C₁₋₆ alkyl, —C₀₋₆ alkylC(O)NR⁶R⁷    and —C₀₋₆ alkylC(O)C₁₋₆ alkyl;

-   R^(2b) is hydrogen, C₁₋₃ alkyl, halo, cyano, C₁₋₃ haloalkyl, C₁₋₃    alkoxy, C₀₋₆ alkylS(O)_(q)C₁₋₃ alkyl;

-   R^(3a) is hydroxyl;

-   R^(3b) is hydrogen, hydroxyl, halo, cyano, C₁₋₃ haloalkyl, C₁₋₃    hydroxyalkyl, C₁₋₃ alkoxy, S(O)_(q)C₁₋₃ alkyl;

-   R⁴ is hydrogen or —C₁₋₃ alkyl;

-   R⁵ is hydrogen or —C₁₋₃ alkyl;

-   R⁶ is hydrogen or —C₁₋₆ alkyl;

-   R⁷ is hydrogen or —C₁₋₆ alkyl;

-   R⁸ is hydrogen or —C₁₆ alkyl;

-   p is 0 or an integer 1 or 2;

-   q is 0 or an integer 1 or 2    or a pharmaceutically acceptable salt thereof, including all    stereoisomers, tautomers and isotopic derivatives thereof.

According to the invention, there is provided a compound of formula(IB′):

wherein

-   R¹ is H, a saturated or unsaturated, branched or unbranched C₁₋₁₅    alkyl chain, wherein optionally one or more carbons (for example 1,    2 or 3 carbons, suitably 1 or 2, in particular 1) is/are replaced by    a heteroatom selected from O, N, S(O)_(p), (for example a CH₂, group    is replaced with O, or with NH, or with S, or with SO₂ or a CH₃    group at the terminus of the chain or on a branch is replaced with    OH or with NH₂) wherein said chain is optionally substituted by one    or more groups (for example 1 to 3, such as 2 groups) independently    selected from oxo, halogen, an aryl group, a heteroaryl group, a    carbocyclyl group or a heterocyclyl group,    -   each aryl, heteroaryl, carbocyclyl or heterocyclyl group        bearing:    -   0 to 3 substituents selected from halogen, -hydroxyl, —C₁₋₆        alkyl, —C₁₋₆ alkoxy, —C₂₋₃ alkoxyOC₁₋₃ alkyl, —C₂₋₃ alkylOC₁₋₃        alkyl, —C₁₋₃ hydroxyalkyl, —C₁₋₆ haloalkyl, amino, —C₁₋₄ mono or        —C₂₋₈ di-alkyl amino, —C₁₋₄ mono or —C₂₋₈ di-acyl amino, —C₀₋₆        alkylS(O)_(p)C₁₋₆ alkyl, —C₀₋₆ alkylS(O)_(p)NR⁶R⁷, —C₀₋₆        alkylNR⁸C₀₋₆alkylS(O)_(p)C₁₋₆ alkyl, —C₀₋₆ alkylC(O)OC₀₋₆ alkyl,        —NR⁸C₀₋₆ alkylC(O)NR⁶R⁷—NR⁸C₀₋₆ alkylC(O)C₀₋₆ alkyl, —C₀₋₆        alkylC(O)NR⁶R⁷, and —C₀₋₆ alkylC(O)C₁₋₆ alkyl; and/or one aryl,        heterocyclyl or carbocyclyl;-   R^(2a) is hydrogen, —C₁₋₃ alkyl, halo, hydroxyl, cyano, —C₁₋₃    haloalkyl, —C₁₋₃ alkoxy, —C₂₋₃ alkoxyOC₁₋₃ alkyl, —C₁₋₃    hydroxyalkyl, —C₀₋₆ alkylS(O)_(q)C₁₋₃ alkyl, —C₀₋₆    alkylS(O)_(p)NR⁶R⁷, —C₀₋₆ alkylNR⁸C₀₋₆ alkylS(O)_(p)C₁₋₆ alkyl,    —C₀₋₆ alkylC(O)OH, —C₀₋₆ alkylC(O)OC₁₋₆ alkyl, —NC₀₋₆    alkylC(O)NR⁶R⁷, —NR⁸C₀₋₆ alkylC(O)C₁₋₆ alkyl, —C₀₋₆ alkylC(O)NR⁶R⁷    and —C₀₋₆ alkylC(O)C₁₋₆ alkyl;-   R^(3a) is hydroxyl;-   R⁴ is hydrogen or —C₁₋₃ alkyl;-   R⁵ is hydrogen or —C₁₋₃ alkyl;-   R⁶ is hydrogen or —C₁₋₆ alkyl;-   R⁷ is hydrogen or —C₁₋₆ alkyl;-   R⁸ is hydrogen or —C₁₆ alkyl;-   p is 0 or an integer 1 or 2;-   q is 0 or an integer 1 or 2    or a pharmaceutically acceptable salt thereof, including all    stereoisomers, tautomers and isotopic derivatives thereof.

According to the invention, there is provided a compound of formula(IB):

wherein

-   R¹ is H, a saturated or unsaturated, branched or unbranched C₁₋₁₅    alkyl chain (such as a C₁₋₁₂ alkyl chain or a C₁₋₁₀ alkyl chain),    wherein optionally one or more carbons (for example 1, 2 or 3    carbons, suitably 1 or 2, in particular 1) is/are replaced by a    heteroatom selected from O, N, S(O)_(p), (for example a CH₂, group    is replaced with O, or with NH, or with S, or with SO₂ or a CH₃    group at the terminus of the chain or on a branch is replaced with    OH or with NH₂) wherein said chain is optionally substituted by one    or more groups independently selected from oxo, halogen, an aryl    group, a heteroaryl group, a carbocyclyl group or a heterocyclyl    group    -   each aryl, heteroaryl, carbocyclyl or heterocyclyl group        bearing:        -   0 to 3 substituents selected from halogen, —C₁₋₆ alkyl,            —C₁₋₆ alkoxy, —C₂₋₃ alkoxyOC₁₋₃ alkyl, —C₁₋₆ haloalkyl,            amino, —C₁₋₄ mono or —C₂₋₈ di-alkyl amino, —C₁₋₄ mono or            —C₂₋₈ di-acyl amino, —C₀₋₆ alkylS(O)_(p)C₁₋₆ alkyl, —C₀₋₆            alkylS(O)_(p)NR⁶R⁷, —C₀₋₆ alkylNR⁸C₀₋₆alkylS(O)_(p)C₁₋₆            alkyl, —C₀₋₆ alkylC(O)OC₀₋₆ alkyl, —NC₀₋₆            alkylC(O)NR⁶R⁷—NC₀₋₆ alkylC(O)C₀₋₆ alkyl, —C₀₋₆            alkylC(O)NR⁶R⁷, and —C₀₋₆ alkylC(O)C₁₋₆ alkyl; and/or one            aryl, heterocyclyl or carbocyclyl;-   R^(2a) is hydrogen, —C₁₋₃ alkyl, halo, hydroxyl, cyano, —C₁₋₃    haloalkyl, —C₁₋₃ alkoxy, —C₂₋₃ alkoxyOC₁₋₃ alkyl, —C₁₋₃    hydroxyalkyl, —C₀₋₆ alkylS(O)_(q)C₁₋₃ alkyl, —C₀₋₆    alkylS(O)_(p)NR⁶R⁷, —C₀₋₆ alkylNR⁸C₀₋₆alkylS(O)_(p)C₁₋₆ alkyl, —C₀₋₆    alkylC(O)OH, —C₀₋₆ alkylC(O)OC₁₋₆ alkyl, —NC₀₋₆ alkylC(O)NR⁶R⁷,    —NR⁸C₀₋₆ alkylC(O)C₁₋₆ alkyl, —C₀₋₆ alkylC(O)NR⁶R⁷ and —C₀₋₆    alkylC(O)C₁₋₆ alkyl;-   R^(3a) is hydroxyl;-   R⁴ is hydrogen or —C₁₋₃ alkyl;-   R⁵ is hydrogen or —C₁₋₃ alkyl;-   R⁶ is hydrogen or —C₁₋₆ alkyl;-   R⁷ is hydrogen or —C₁₋₆ alkyl;-   R⁸ is hydrogen or —C₁₆ alkyl;-   p is 0 or an integer 1 or 2;-   q is 0 or an integer 1 or 2    or a pharmaceutically acceptable salt thereof, including all    stereoisomers, tautomers and isotopic derivatives thereof.

In one embodiment there is provided a compound of formula (IC):

wherein R¹, R^(3a), R^(3b), R⁴ and R⁵ are as defined above for compoundsof formula (I).

In one embodiment there is provided a compound of formula (ID):

wherein R¹, R^(2a), R^(2b), R^(3a), R^(3b), R⁴ and R⁵ are as definedabove for compounds of formula (I).

In one embodiment there is provided a compound of formula (IE):

wherein R¹, R^(3a), R^(3b), R⁴ and R⁵ are as defined above for compoundsof formula (I).

In one embodiment there is provided a compound of formula (IF):

wherein R¹, R^(2a), R^(3a), R^(3b), R⁴ and R⁵ are as defined above forcompounds of formula (I).

In one embodiment there is provided a compound of formula (IG):

wherein R¹, R^(2a), R^(3a), R^(3b), R⁴ and R⁵ are as defined above forcompounds of formula (I).

The compounds of the present disclosure are at least PI3K deltainhibitors. Certain compound of the disclosure may be PI3K alpha anddelta inhibitors. Certain compounds of the disclosure may be PI3K deltaand gamma inhibitors. Some compounds may be alpha and gamma isozymeinhibitors. Other compounds may be alpha, delta and gamma subtypeinhibitors. It is proposed that different biological profiles may beassociated with these different inhibition profiles which may beadvantageous in targeting pathways for different diseases.

Inhibitor as employed here is intended to refer to a compound thatreduces (for example by at least 50%) or eliminates the biologicalactivity of the target, for example PI3K delta, in an in vitro enzymeassay.

The compounds of the present disclosure are active in cell basedscreening systems and thereby demonstrate that they possess suitableproperties for penetrating cells.

General references to compounds of formula (I) herein are intended toinclude references to compounds of formula (IA)-(IG) unless the contextsuggests otherwise.

Alkyl as used herein refers to straight chain or branched chain alkyl,such as, without limitation, methyl, ethyl, propyl, iso-propyl, butyl,and tert-butyl. In one embodiment alkyl refers to straight chain alkyl.

Alkoxy as used herein refers to straight or branched chain alkoxy, forexample methoxy, ethoxy, propoxy, butoxy. Alkoxy as employed herein alsoextends to embodiments in which the oxygen atom is located within thealkyl chain, for example —(CH₂)_(n)OCH₃. In one embodiment the alkoxy islinked through oxygen to the remainder of the molecule. In oneembodiment the alkoxy is linked through carbon to the remainder of themolecule. In one embodiment the disclosure relates to straight chainalkoxy.

—C₂₋₃ alkoxyOC₁₋₃ alkyl as employed herein is intended to refer an —C₂₋₃alkoxy linked to the remainder of the molecule through oxygen to provideoxygen-alkylene-oxygen-alkyl.

Carbocyclyl as employed herein is intended to refer to C₃₋₁₀ saturatedor partially saturated carbocyclic ring systems, for examplecyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl.

Heteroaryl is a C₅₋₉ membered aromatic carbocylic ring or bicyclic ringsystem comprising one or more, (for example 1, 2, 3 or 4) heteroatomsindependently selected from O, N and S. Examples of heteroaryls include:pyrrole, oxazole, thiazole, isothiazole, imidazole, pyrazole, isoxazole,pyridazine, pyrimidine, pyrazine, benzothiophene, benzofuran, or 1, 2, 3and 1, 2, 4 triazole. In a bicyclic ring system the definition ofheteroaryl will be satisfied if at least one ring contains a heteroatomand at least one ring is aromatic. The heteroaryl may be linked to theremainder of the molecule through a carbocyclic ring or a ringcomprising a heteroatom.

In a bicyclic system the definition of aromatic will be satisfied by thearomatic nature of at least one ring in the system.

Heterocyclic groups as employed herein is intended to refer to a 5 to 10membered ring system which is saturated or partially unsaturated andwhich is non-aromatic comprising one or more (for example 1, 2 or 3 inparticular 1 or 2,) heteroatoms independently selected from O, N and S,for example 5 or 6 or 7 membered rings including pyrrolidine,tetrahydrofuran, tetrahydrothiophene, piperidine, piperazine,morpholine, 1,4-dioxane, pyrrolidine and oxoimidazolidine such aspyrrolidine, tetrahydrofuran, tetrahydrothiophene, piperidine,piperazine, morpholine, and 1,4-dioxane, and in particular piperidine,piperazine, and morpholine. An example of a saturated 7 memberedheterocyclic ring is a 1,4-diazepane ring and an example of a partiallyunsaturated 7 membered ring is a 2,3,4,5-tetrahydro-1,4-oxazepine.

A heterocyclic group may be linked to, for example, an alkyl chain,through carbon or a suitable heteroatom such as N.

Oxo as employed herein refers to the group ═O and can be attached to acarbon atom to give C═O or to a heteroatom to give, for example, S═O orSO₂.

Haloalkyl as employed herein is intended to refer to a group having from1 to 6 halo atoms, for example 1 to 5 halo atoms. In one embodiment thehaloalkyl is per haloalkyl, for example per fluoroalkyl, such as CF₂CF₃and CF₃.

Halo represents bromo, chloro or fluoro.

C₁₋₄ mono or C₂₋₈ diacyl is intended to refer to —C(O)C₁₋₄ alkyl and—(COC₁₋₄ alkyl)₂ respectively.

Aryl as used herein refers to, for example C₆₋₁₄ mono or polycyclicgroups (such as C₆₋₁₀ mono or bicyclic groups) having from 1 to 3 ringswherein at least one ring is aromatic including phenyl, napthyl,anthracenyl, 5,6,7,8-tetrahydronapthyl and the like, such as phenyl andnapthyl.

In one embodiment X is phenyl.

In one embodiment X is a C₅₋₉ membered heteroaryl.

In one embodiment X is pyrazinyl, such as pyrazin-2-yl, in particularmethylpyrazin-2-yl, more specifically 5-methylpyrazin-2-yl.

In one embodiment X is benzothiophenyl, for example benzothiophen-2-yl.

In one embodiment X is benzofuranyl, for example benzofura-5-yl.

In one embodiment X is thiazolyl, for example thiazol-4-yl.

In one embodiment X is isoxazolyl, for example isoxazol-3-yl, such as5-methylisoxazol-3-yl.

In R¹ a suitable heteroatom may replace any carbon including a linkingcarbon, branched carbon or a terminal carbon and hydrogen(s) may fillthe remaining valencies, as appropriate.

In one embodiment R¹ is H.

In another embodiment R¹ is branched or unbranched C₁₋₁₀ alkyl chain,wherein at least one carbon (for example 1, 2 or 3 carbons) is replacedby an oxygen, for example C₉ alkyl comprising 1, 2 or 3 oxygen atoms,such as —CH₂OCH₂CH₂OCH₂CH₂OCH₃.

In one embodiment R¹ is —CH₂OCH₃.

In one embodiment R¹ is —CH₂CH₂CH₂OH.

In one embodiment R¹ is —CH₂OCH₂CH₂OCH₂CH₂OH.

In one embodiment R¹ bears at least one oxo substituent.

In one embodiment R¹ is —CH₂NHCONH₂.

In one embodiment R¹ bears at least one carbocyclic group as asubstitutent.

In one embodiment R¹ bears at least one oxo substituent and acarbocyclic group substituent, for example cyclopentyl or cyclohexyllinked to a carbon bearing an oxo substituent, such as the fragment:

In one embodiment R¹ comprises:

In one embodiment R¹ comprises:

In one embodiment R¹ comprises:

In one embodiment R¹ comprises:

In one embodiment R¹ bears at least one heterocyclic group substituent.

In one embodiment R¹ bears one oxo substituent and one heterocyclicgroup substituent, for example the heterocyclic group is linked to acarbon bearing an oxo substituent, such as R¹ comprising—C(O)morpholinyl wherein the morpholinyl may be linked through N, inparticular the fragment:

or—C(O)piperidinyl such as the fragment:

In one embodiment R¹ bears one oxo substituent and one heterocyclicgroup substituent, for example the heterocyclic group is linked to acarbon bearing an oxo substituent, wherein said heterocyclic groupitself bears a C₁₋₆ alkyl or a —C(O)C₁₋₆ alkyl substitutent, such as R¹comprising —C(O)piperidinylC₁₋₆ alkyl or —C(O)piperidinylC(O)C₁₋₆ alkylwherein the piperidinyl may be linked through N, in particular thefragments:

In one embodiment R¹ represents:

In one embodiment R¹ represents:

In one embodiment R¹ represents:

In one embodiment R¹ bears one oxo substituent and one heterocyclicgroup substituent, for example the heterocyclic group is linked to acarbon bearing an oxo substituent, wherein said heterocyclic groupitself bears a heterocyclic group as a substituent thereon, such as R¹comprising —C(O)piperidinylmorpholinyl wherein the morpholinyl may belinked through N, in particular the fragment:

In one embodiment R¹ comprises:

In one embodiment R¹ comprises:

In one embodiment R¹ comprises:

In one embodiment R¹ represents:

In one embodiment R¹ represents:

In one embodiment R¹ represents:

In one embodiment R¹ represents:

In one embodiment R¹ represents:

In one embodiment R¹ represents:

In one embodiment R¹ represents:

In one embodiment R¹ represents:

In one embodiment R¹ represents:

In one embodiment R¹ represents:

In one embodiment R¹ represents:

In one embodiment R¹ represents:

In one embodiment R¹ represents:

In one embodiment R¹ comprises a carboxylic acid, for example C₁₋₃alkyleneCO₂H such as the fragment —CH₂CH₂CH₂CO₂H or alternatively—CH₂CH₂CH₂CH₂CO₂H.

In one embodiment R¹ represents —CH₂CH₂CH₂C(O)NHCH(CH₃)₂.

In one embodiment R¹ represents —CH₂CH₂CH₂C(O)(CH₃)₂.

In one embodiment R¹ represents —CH₂CH₂CH₂NHCH₂CH₂OCH₃.

In one embodiment R¹ represents —CH₂CH₂CH₂N(CH₂CH₂OCH₃)₂.

In one embodiment R¹ represents —CH₂CH₂CH₂C(O)N(CH₂CH₂OCH₃)₂.

In one embodiment R¹ represents —CH₂NHC(O)CH₂NHC(O)CH₃.

In one embodiment R¹ represents —CH₂CH₂CH₂C(O)NHCH₂CH₂OCH₃.

In one embodiment R¹ comprises:

In one embodiment R¹ comprises:

In one embodiment R¹ represents:

In one embodiment R¹ represents:

In one embodiment R^(2a) is located in the ortho position.

In one embodiment R^(2a) is located in the meta position.

In one embodiment R^(2a) is located in the para position.

In one embodiment R^(2a) is C₁₋₃alkyl, halo, cyano, C₁₋₃ haloalkyl, C₁₋₃alkoxy, S(O)_(q)C₁₋₃ alkyl, —C(O)OC₁₋₆ alkyl, —NC(O)NC₁₋₆ alkyl,—NC(O)C₁₋₆ alkyl, —C(O)NC₁₋₆ alkyl, and —C(O)C₁₋₆ alkyl.

In one embodiment R^(2a) is selected from the group comprising methyl,chloro, fluoro, cyano, methoxy, trifluoromethyl and SO₂CH₃.

In one embodiment R^(2a) is chloro.

In one embodiment R^(2a) is fluoro.

In one embodiment R^(2a) is cyano.

In one embodiment R^(2a) is methoxy.

In one embodiment R^(2a) is methyl.

In one embodiment R^(2a) is SO₂CH₃.

In one embodiment R^(2a) is —C(O)OCH₃.

In one embodiment R^(e)a is CF₃.

In one embodiment R^(2b) is hydrogen.

In one embodiment R^(2b) is chloro.

In one embodiment R^(2b) is —OCH₃.

In one embodiment R^(2a) are R^(2b) are in the 2,3 or 2,4 or 3,4, or 3,5positions respectively.

In one embodiment R^(2a) is CF₃ and R^(2b) is methoxy.

R^(3a) is suitably in the ortho, meta or para position, such as theortho or para position.

In one embodiment R^(3b) is hydrogen.

In one embodiment R^(3b) is fluoro or chloro, for example in the4-position.

In one embodiment R^(3a) and R^(3b) are in the 3,4 positionrespectively.

In one embodiment R⁴ is H.

In one embodiment R⁵ is H.

In one embodiment p is 2.

In one embodiment q is 2.

In one embodiment there is a provided a pharmaceutically acceptable acidaddition salt of a compound of formula (I).

The pharmaceutically acceptable acid addition salts as mentionedhereinabove are meant to comprise the therapeutically active non-toxicacid addition salt forms that the compounds of formula (I) are able toform. These pharmaceutically acceptable acid addition salts canconveniently be obtained by treating the base form with such appropriateacid. Appropriate acids comprise, for example, inorganic acids such ashydrohalic acids, e.g. hydrochloric or hydrobromic acid, sulfuric,nitric, phosphoric and the like acids; or organic acids such as, forexample, acetic, propanoic, hydroxyacetic, lactic, pyruvic, oxalic (i.e.ethanedioic), malonic, succinic (i.e. butanedioic acid), maleic,fumaric, malic, tartaric, citric, methanesulfonic, ethanesulfonic,benzenesulfonic, p-toluenesulfonic, cyclamic, salicylic,p-aminosalicylic, pamoic and the like acids.

Examples of salts of compound (I) include all pharmaceuticallyacceptable salts, such as, without limitation, acid addition salts ofmineral acids such as HCl and HBr salts and addition salts of organicacids such as a methansulfonic acid salt.

The disclosure also extends to solvates of the compounds herein.Examples of solvates include hydrates.

The compounds of the disclosure include those where the atom specifiedis a naturally occurring or non-naturally occurring isotope. In oneembodiment the isotope is a stable isotope. Thus the compounds of thedisclosure include, for example those containing one or more deuteriumatoms in place of hydrogen atoms and the like.

The compounds described herein may include one or more chiral centres,and the disclosure extends to include racemates, both enantiomers (forexample each substantially free of the other enantiomer) and allstereoisomers resulting therefrom. In one embodiment one enantiomericform is present in a purified form that is substantially free of thecorresponding entaniomeric form.

The disclosure also extends to all polymorphic forms of the compoundsherein defined.

In one aspect a compound of formula (I) is:

-   2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-ethynylquinazolin-4(3H)-one;-   2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(3-(2-(2-methoxyethoxy)ethoxy)prop-1-yn-1-yl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;-   6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)hex-5-ynoic    acid;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;-   3-((2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-(3-(2-(2-hydroxyethoxy)ethoxy)prop-1-yn-1-yl)-4-oxoquinazolin-3(4H)-yl)methyl)benzonitrile;-   2-((4-amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(3-(2-morpholinoethoxy)prop-1-ynyl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-ethynylquinazolin-4(3H)-one;-   2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(3-chlorobenzyl)-5-ethynylquinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(3-chlorobenzyl)-5-ethynylquinazolin-4(3H)-one;-   2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(2-fluorobenzyl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(2-fluorobenzyl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(3-methoxybenzyl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(3-methoxybenzyl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(3-(trifluoromethyl)benzyl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(3-(trifluoromethyl)benzyl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(4-chlorobenzyl)-5-ethynyl    quinazolin-4(3H)-one;-   2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(4-(methylsulfonyl)benzyl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(4-(methylsulfonyl)benzyl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(4-(trifluoromethyl)benzyl)quinazolin-4(3H)-one;-   3-((2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-4-oxoquinazolin-3(4H)-yl)methyl)benzonitrile;-   2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(3-(methylsulfonyl)benzyl)quinazolin-4(3H)-one;-   3-((2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-4-oxoquinazolin-3(4H)-yl)methyl)benzonitrile;-   2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(4-chlorobenzyl)-5-ethynylquinazolin-4(3H)-one;-   2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(4-chlorobenzyl)-5-(3-methoxyprop-1-ynyl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(3-methoxy    benzyl)-5-(3-methoxyprop-1-ynyl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(3-methoxyprop-1-ynyl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(4-(trifluoromethyl)benzyl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(3-(2-methoxyethoxy)prop-1-ynyl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-((5-methylisoxazol-3-yl)methyl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-((5-methylisoxazol-3-yl)methyl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(3-chloro-2-fluorobenzyl)-5-ethynylquinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2,6-difluoro    benzyl)-5-ethynylquinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(4-chloro-2-fluorobenzyl)-5-ethynylquinazolin-4(3H)-one;-   2-((4-Amino-3-(3-fluoro-4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-ethynylquinazolin-4(3H)-one;-   2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-(3-methoxy    prop-1-ynyl)-3-(3-(trifluoromethyl)benzyl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(4-fluorobenzyl)    quinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(3-cyclopentylprop-1-ynyl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-(3-(benzyloxy)    prop-1-ynyl)-3-(2-chlorobenzyl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(5-hydroxypent-1-ynyl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(2-fluoro-5-methoxybenzyl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(3,4-dichlorobenzyl)-5-ethynylquinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-benzyl-5-ethynylquinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(2-trifluoromethylbenzyl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(4-methoxybenzyl)quinazolin-4(3H)-one;-   4-((2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyri m id    in-1-yl)methyl)-5-ethynyl-4-oxoquinazolin-3(4H)-yl)methyl)benzonitrile;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(2-fluoro-4-methoxybenzyl)quinazolin-4(3H)-one;-   1-(3-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)prop-2-ynyl)    urea;-   2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-fluorobenzyl)-5-(3-(2-(2-methoxyethoxy)ethoxy)prop-1-ynyl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(4-fluoro-3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-ethynylquinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(3-phenoxyprop-1-ynyl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-fluorobenzyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;-   6-(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(2-methoxyethyl)hex-5-ynamide;-   2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(7-morpholino-7-oxohept-1-yn-1-yl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(5-morpholino-5-oxopent-1-yn-1-yl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-c]pyrimidin-1-yl)methyl)-3-((5-methyl    pyrazin-2-yl)methyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-oxo-6-(piperidin-1-yl)hex-1-yn-1-yl)quinazolin-4(3H)-one;-   6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N,    N-diethylhex-5-ynamide;-   7-(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)hept-6-ynoic    acid;-   2-Acetamido-N-(3-(2-((4-amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)-   methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)prop-2-yn-1-yl)acetamide;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(3-methoxy-5-(trifluoromethyl)benzyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-methoxy    phenethyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(benzo[b]thiophen-2-ylmethyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-fluoro-3-methoxybenzyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;-   Methyl    3-((2-((4-amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)-4-oxoquinazolin-3(4H)-yl)methyl)benzoate;-   2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-34(1-methyl-1H-pyrazol-4-yl)methyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(benzofuran-5-ylmethyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-((2-methyl    thiazol-4-yl)methyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-(4-methylpiperazin-1-yl)-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-(4-morpholinopiperidin-1-yl)-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;-   5-(6-(4-Acetylpiperazin-1-yl)-6-oxohex-1-yn-1-yl)-2-((4-amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)quinazolin-4(3H)-one;-   N-(4-(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyri m id    in-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)but-3-yn-1-yl)morpholine-4-carboxamide;-   5-(6-(4-Acetylpiperazin-1-yl)-6-oxohex-1-yn-1-yl)-2-((4-amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)quinazolin-4(3H)-one;-   N-(4-(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)but-3-yn-1-yl)morpholine-4-carboxamide;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-(5-(bis(2-methoxyethyl)amino)pent-1-ynyl)-3-(2-chlorobenzyl)quinazolin-4(3H)-one;-   6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-cyclopentylhex-5-ynamide;-   6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(tetrahydro-2H-pyran-4-yl)hex-5-ynamide;-   6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-c]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(2-morpholinoethyl)hex-5-ynamide;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-(4-(2-methoxyethyl)piperazin-1-yl)-6-oxohex-1-ynyl)quinazolin-4(3H)-one;-   6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(2-(dimethylamino)ethyl)hex-5-ynamide;-   6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(pyridin-4-yl)hex-5-ynamide;-   6-(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(pyridin-4-yl)hex-5-ynamide;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-(4-(dimethylamino)    piperidin-1-yl)-6-oxohex-1-ynyl)quinazolin-4(3H)-one;-   6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N,N-bis(2-methoxyethyl)hex-5-ynamide;-   6-(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N,N-bis(2-methoxyethyl)hex-5-ynamide;-   6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(2-(4-methylpiperazin-1-yl)ethyl)hex-5-ynamide;-   6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-methyl-N-(2-(4-methylpiperazin-1-yl)ethyl)hex-5-ynamide;-   6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-isopropylhex-5-ynamide;-   6-(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-isopropylhex-5-ynamide;-   6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N,N-dimethylhex-5-ynamide;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-oxo-6-(pyrrolidin-1-yl)hex-1-yn-1-yl)quinazolin-4(3H)-one;-   6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(pyrrolidin-3-yl)hex-5-ynamide;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-(3-(dimethylamino)pyrrolidin-1-yl)-6-oxohex-1-ynyl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-(3-(dimethylamino)pyrrolidin-1-yl)-6-oxohex-1-ynyl)quinazolin-4(3H)-one;-   2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-(4-methyl-1,4-diazepan-1-yl)-6-oxohex-1-ynyl)quinazolin-4(3H)-one,-   2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-(4-methyl-1,4-diazepan-1-yl)-6-oxohex-1-ynyl)quinazolin-4(3H)-one,-   2-((4-Amino-3-(4-hydroxy-3-methoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-morpholino-6-oxohex-1-ynyl)quinazolin-4(3H)-one    or a pharmaceutically acceptable salt thereof, including all    stereoisomers, tautomers and isotopic derivatives thereof.

Compounds of formula (I) can be prepared by a process comprisingreacting compounds of formula (II):

or a protected derivate thereof wherein X, R^(3a), R^(3b), R⁴ and R⁵ areas defined above for compounds of formula (I) and LG₁ represents aleaving group such as halo, in particular bromo, with a compound offormula (III):

≡—R¹   (III)

or a protected derivative thereof, wherein R¹ is as defined above forcompounds of formula (I), in the presence of a suitable catalyst, anorganic base and a polar aprotic solvent, under an inert atmosphere; andoptionally deprotecting to reveal a compound of formula (I); andoptionally converting one compound of formula (I) into another compoundof formula (I) by standard functional group transformations.

Suitable catalysts include palladium catalysts such asbis(triphenylphosphine)palladium (II) dichloride, in the presence ofcopper iodide.

A suitable polar aprotic solvent is DMF.

A suitable inert atmosphere is nitrogen.

The reaction may be performed employing irradiation, for example usingmicrowave irradiation at 120° C. and a power setting of 200 W.

The deprotection, to reveal a compound of formula (I) where, for exampleR¹ is H, and the protective group is a silyl group can be effected bytreatment with a reagent such as tetrabutylammonium chloride in thepresence of a polar aprotic solvent such as DMF. The reaction may beperformed at a reduced temperature, such as about 0° C.

Compounds of formula (I) wherein R¹ comprises a carboxylic acid moietycan be converted to other compounds of formula (I) by routinetechniques, for example amide couplings.

Further examples of converting a compound of formula (I) into othercompounds of formula (I) are provided by those compounds of formula (I)wherein R¹ comprises a primary alcohol. Such compounds may betransformed into compounds of formula (I) wherein R¹ comprises a primaryalkyl halide, and then, by subsequent reaction with a primary orsecondary amine, into a compound of formula (I) wherein R¹ comprises analkyl amine.

Compounds of formula (II) can be prepared by reacting a compound offormula (IV):

or a protected derivative thereof, wherein LG₁ and X are as definedabove for compounds of formula (II) and LG₂ is a leaving group, forexample halo, such as chloro, with a compound of formula (V):

or a protected derivative thereof, wherein R^(3a), R^(3b), R⁴ and R⁵ areas defined above for compounds of formula (I), in the presence of abase, in a polar aprotic solvent.

Suitable protecting groups for compounds of formula (V) in which R^(3a)is hydroxyl include a tertbutyldimethylsilylether.

Suitable bases include potassium carbonate.

A suitable polar aprotic solvent is DMF.

Alternatively compounds of formula (II) can be prepared by reacting acompound of formula (VI):

or a protected derivative thereof, wherein LG₁, X, R⁴ and R⁵ are asdefined above for compounds of formula (II) and LG₃ represents a leavinggroup such as halo, in particular iodo, with a compound of formula(VII):

or a protected derivate thereof, wherein R^(3a) and R^(3b) are asdefined above for compounds of formula (I), in the presence of asuitable noble metal catalyst, an inorganic base and a polar proticsolvent, under an inert atmosphere; followed, where appropriate, bydeprotection of the groups R^(3a) and/or R^(3b), and/or X.

A suitable catalyst is tetrakis(triphenylphosphine)palladium(0).

A suitable inorganic base is sodium carbonate.

A suitable polar protic solvent is ethanol.

The reaction may be performed at an elevated temperature, for example at85° C. for several days for example 3 days before cooling to RT.

Compounds of formula (VI) can be prepared by reacting a compound offormula (IV) or a protected derivative thereof, wherein LG₁ LG₂ and Xare as defined above with a compound of formula (VIII):

or a protected derivative thereof, wherein R⁴ and R⁵ are as definedabove for compounds of formula (I) and LG₃ is a leaving group, forexample a halogen atom, in particular an iodo substituent. The reactionis conveniently conducted in a polar aprotic solvent and in the presenceof an inorganic base at ambient temperature, such as RT and in the dark.

A suitable inorganic base is sodium carbonate.

A suitable polar aprotic solvent is DMF.

Compounds of formula (V) wherein R^(3a), R^(3b), R⁴ and R⁵ are asdefined above, may be prepared by reacting a compound of formula (VIII)wherein LG₃, R⁴ and R⁵ are as defined above with a compound of formula(VII) or a protected derivate thereof, wherein R^(3a) and R^(3b) are asdefined above for compounds of formula (I):

Compounds of formula (IV) may be prepared by reacting a compound offormula (IX):

or a protected derivative thereof wherein LG₁ is as defined above forcompounds of formula (II) and LG₄ is a leaving group, for example halo,such as chloro, or hydroxy with a compound of formula (X):

such asor a protected derivative thereof, wherein X, R^(2a) and R^(2b) are asdefined above for compounds of formula (II), in the presence of asuitable reagent, such as a phosphorus trihalide, an organic base and anon-polar solvent.

A suitable phosphorus trihalide is phosphorus trichloride.

A suitable non-polar solvent is toluene.

A suitable organic base is triethylamine.

Protection of the hydroxyl may, for example, be effected using TBDMSCIin a suitable solvent, for example DMF in the presence of a suitablebase such as imidazole.

Compounds of formula (IX) may be prepared by reacting a compound offormula (XI):

or a protected derivative thereof, wherein LG₁ is as defined above forcompounds of formula (II) with a compound of formula (XII):

wherein LG₅ and LG₆ are leaving groups, for example halo, such as chloroin presence of a suitable solvent and a suitable base.

A suitable solvent is toluene and a suitable base is pyridine.

Protecting groups may be required to protect chemically sensitive groupsduring one or more of the reactions described above, to ensure that theprocess is efficient. Thus if desired or necessary, intermediatecompounds may be protected by the use of conventional protecting groups.Protecting groups and means for their removal are described in“Protective Groups in Organic Synthesis”, by Theodora W. Greene andPeter G. M. Wuts, published by John Wiley & Sons Inc; 4^(th) Rev Ed.,2006, ISBN-10: 0471697540.

Novel intermediates are claimed as an aspect of the invention.

The compounds of formulae (III), (VII), (VIII), (X) and (XI) and (XII)as defined above, are either commercially available or can be readilyprepared from commercially available starting materials, using routinepublished techniques (see for example Table 1).

A selection of the compounds of formula (I), disclosed herein, have beenscreened by chiral stationary phase HPLC for the presence of noninterconverting rotational isomers, otherwise known as atropisomers.Atropisomerism results from hindered rotation about a single bond wherethe torsional energy barrier to free rotation is sufficiently high tosignificantly slow the interconversion of non-superimposable conformers.The analytical and preparative methods disclosed below have been used toresolve the discrete atropisomers of a number of published PI3Kinhibitors, revealing that they ordinarily occur as mixtures ofstereoisomers possessing very long half-lives (months or years) underphysiological conditions. (See experimental section for details). Theoccurrence of atropisomerism represents an added burden of complexity tothe development of such compounds as therapeutic agents, since discretestereoisomers are usually highly preferred over mixtures, such asracemates.

Analysis of selected examples using the chromatographic methodsdisclosed herein have revealed no evidence that the compounds of formula(I) exhibit atropisomerism. In the absence of additional features thatare well known to give rise to stereoisomers, for example a stereogeniccentre, the current disclosure provides for compounds thatadvantageously exist as single discrete molecular entities. Thus thecompounds of the present disclosure are particularly useful astherapeutically active agents in pharmaceutical compositions and intreatment.

In one aspect the compounds are useful in treatment, for example COPDand/or asthma.

The PI3K compounds developed to date have typically been intended fororal administration. Typically this strategy involves the optimisationof a compound's pharmacokinetic profile in order to achieve an adequateduration of action. In this way a sufficiently high drug concentrationis established and maintained between doses to provide continuousclinical benefit. An inevitable and frequently undesired consequence ofthis approach is that non-targeted body tissues, especially the liverand the gut, are likely to be exposed to pharmacologically activeconcentrations of the drug.

An alternative strategy is to design treatment regimens in which thedrug is dosed directly to the inflamed organ (for example topicaltherapy). Although this approach is not suitable for treating allchronic inflammatory conditions, it has been extensively exploited intreating lung diseases (asthma, COPD), skin lesions (atopic dermatitisand psoriasis), nasal diseases (allergic rhinitis) and gastrointestinaldisorders (ulcerative colitis).

In topical therapy, the desired efficacy can sometimes be achieved byensuring that the drug has a sustained duration of action and isretained predominantly in the target organ, thereby minimising the risksof systemic toxicity. Alternatively an appropriate formulation can beused which generates a “reservoir” of the active drug which is thenavailable to sustain the desired effects. The first approach isexemplified in the use of the anticholinergic drug tiotropium bromide(Spiriva HandiHaler®), which is administered topically to the lung as atreatment for COPD. This compound has an exceptionally high affinity forits target receptor resulting in a very slow off rate (dissociationrate) and a consequent sustained duration of action.

There is provided according to one aspect of the present disclosure useof a compound of formulation as a PI3 kinase inhibitor, for exampleadministered topically to the lung.

In one aspect of the disclosure the compounds herein are particularlysuitable for topical delivery, such as topical delivery to the lungs, inparticular for the treatment of COPD.

Thus is one aspect there is provided use of compounds of formula (I) forthe treatment of COPD and/or asthma, in particular COPD or severeasthma, by inhalation i.e. topical administration to the lung.Advantageously, administration to the lung allows the beneficial effectsof the compounds to be realised whilst minimising the side-effects, forpatients.

In one embodiment the compounds are suitable for sensitizing patients totreatment with a corticosteroid.

The compounds herein may also be useful for the treatment of rheumatoidarthritis.

Further, the present invention provides a pharmaceutical compositioncomprising a compound according to the disclosure optionally incombination with one or more pharmaceutically acceptable diluents orcarriers.

Diluents and carriers may include those suitable for parenteral, oral,topical, mucosal and rectal administration, and may be differentdepending on the route of administration.

In one embodiment compositions may be prepared e.g. for parenteral,subcutaneous, intramuscular, intravenous, intra-articular orperi-articular administration, particularly in the form of liquidsolutions or suspensions; for oral administration, particularly in theform of tablets or capsules; for topical e.g. pulmonary or intranasaladministration, particularly in the form of powders, nasal drops oraerosols and transdermal administration; for mucosal administration e.g.to buccal, sublingual or vaginal mucosa, and for rectal administratione.g. in the form of a suppository.

The compositions may conveniently be administered in unit dosage formand may be prepared by any of the methods well-known in thepharmaceutical art, for example as described in Remington'sPharmaceutical Sciences, 17th ed., Mack Publishing Company, Easton, Pa.,(1985).

Formulations for parenteral administration may contain as excipientssterile water or saline, alkylene glycols such as propylene glycol,polyalkylene glycols such as polyethylene glycol, oils of vegetableorigin, hydrogenated naphthalenes and the like.

Formulations for nasal administration may be solid and may containexcipients, for example, lactose or dextran, or may be aqueous or oilysolutions for use in the form of nasal drops or metered spray. Forbuccal administration typical excipients include sugars, calciumstearate, magnesium stearate, pregelatinated starch, and the like.

Compositions suitable for oral administration may comprise one or morephysiologically compatible carriers and/or excipients and may be insolid or liquid form. Tablets and capsules may be prepared with bindingagents, for example, syrup, acacia, gelatin, sorbitol, tragacanth, orpoly-vinylpyrollidone; fillers, such as lactose, sucrose, corn starch,calcium phosphate, sorbitol, or glycine; lubricants, such as magnesiumstearate, talc, polyethylene glycol, or silica; and surfactants, such assodium lauryl sulfate. Liquid compositions may contain conventionaladditives such as suspending agents, for example sorbitol syrup, methylcellulose, sugar syrup, gelatin, carboxymethyl-cellulose, or ediblefats; emulsifying agents such as lecithin, or acacia; vegetable oilssuch as almond oil, coconut oil, cod liver oil, or peanut oil;preservatives such as butylated hydroxyanisole (BHA) and butylatedhydroxytoluene (BHT). Liquid compositions may be encapsulated in, forexample, gelatin to provide a unit dosage form.

Solid oral dosage forms include tablets, two-piece hard shell capsulesand soft elastic gelatin (SEG) capsules.

A dry shell formulation typically comprises of about 40% to 60%concentration of gelatin, about a 20% to 30% concentration ofplasticizer (such as glycerin, sorbitol or propylene glycol) and about a30% to 40% concentration of water. Other materials such aspreservatives, dyes, opacifiers and flavours also may be present. Theliquid fill material comprises a solid drug that has been dissolved,solubilized or dispersed (with suspending agents such as beeswax,hydrogenated castor oil or polyethylene glycol 4000) or a liquid drug invehicles or combinations of vehicles such as mineral oil, vegetableoils, triglycerides, glycols, polyols and surface-active agents.

Suitably the compound of formula (I) is administered topically to thelung. Hence in one embodiment there is provided a pharmaceuticalcomposition comprising a compound of the disclosure optionally incombination with one or more topically acceptable diluents or carriers.Topical administration to the lung may be achieved by use of an aerosolformulation. Aerosol formulations typically comprise the activeingredient suspended or dissolved in a suitable aerosol propellant, suchas a chlorofluorocarbon (CFC) or a hydrofluorocarbon (HFC). Suitable CFCpropellants include trichloromonofluoromethane (propellant 11),dichlorotetrafluoromethane (propellant 114), and dichlorodifluoromethane(propellant 12). Suitable HFC propellants include tetrafluoroethane(HFC-134a) and heptafluoropropane (HFC-227). The propellant typicallycomprises 40% to 99.5% e.g. 40% to 90% by weight of the total inhalationcomposition. The formulation may comprise excipients includingco-solvents (e.g. ethanol) and surfactants (e.g. lecithin, sorbitantrioleate and the like). Aerosol formulations are packaged in canistersand a suitable dose is delivered by means of a metering valve (e.g. assupplied by Bespak, Valois or 3M).

Topical administration to the lung may also be achieved by use of anon-pressurised formulation such as an aqueous solution or suspension.This may be administered by means of a nebuliser. Topical administrationto the lung may also be achieved by use of a dry-powder formulation. Adry powder formulation will contain the compound of the disclosure infinely divided form, typically with a mass mean diameter (MMAD) of 1-10μm. The formulation will typically contain a topically acceptablediluent such as lactose, usually of large particle size e.g. a mass meandiameter (MMAD) of 100 μm or more. Example dry powder delivery systemsinclude SPINHALER, DISKHALER, TURBOHALER, DISKUS, SKYEHALER, ACCUHALERand CLICKHALER.

In one embodiment a compound of the present is provided as a micronizeddry powder formulation, for example comprising lactose of a suitablegrade, filled into a device such as DISKUS.

Compounds according to the disclosure are intended to have therapeuticactivity. In a further aspect, the present invention provides a compoundof the disclosure for use as a medicament.

Compounds according to the disclosure may also be useful in thetreatment of respiratory disorders including COPD (including chronicbronchitis and emphysema), asthma, paediatric asthma, cystic fibrosis,sarcoidosis, idiopathic pulmonary fibrosis, allergic rhinitis, rhinitis,sinusitis, especially asthma, chronic bronchitis and COPD.

Compounds of the disclosure may also re-sensitise the patient'scondition to treatment with a corticosteroid, when the patient'scondition has become refractory to the same.

One or more compounds of the disclosure may exhibit anti-viral activityand prove useful in the treatment of viral exacerbations of asthmaand/or COPD.

The compounds of the present disclosure may also be useful in theprophylaxis, treatment or amelioration of flu virus, rhinovirus and/orrespiratory syncytial virus.

Compounds according to the disclosure are also expected to be useful inthe treatment of certain conditions which may be treated by topical orlocal therapy including allergic conjunctivitis, conjunctivitis,allergic dermatitis, contact dermatitis, psoriasis, ulcerative colitis,inflamed joints secondary to rheumatoid arthritis or osteoarthritis.

In one embodiment the compounds of formula (I) are thought to be usefulin the, treatment of Hepatitis C and/or HIV, when administered by anappropriate route. Appropriate routes of administration may includeoral, intravenous injection or infusion.

In one embodiment a compound of formula (I) for the treatment ofHepatitis C is delivered to the blood pre-entry to the liver.

Compounds of the disclosure are also expected to be useful in thetreatment of certain other conditions including rheumatoid arthritis,pancreatitis, cachexia, inhibition of the growth and metastasis oftumours including non-small cell lung carcinoma, breast carcinoma,gastric carcinoma, colorectal carcinomas and malignant melanoma.

Thus, in a further aspect, the present invention provides a compound asdescribed herein for use in the treatment of one or more of the abovementioned conditions.

In a further aspect, the present invention provides use of a compound asdescribed herein for the manufacture of a medicament for the treatmentof one or more of the above mentioned conditions.

In a further aspect, the present invention provides a method oftreatment of the above mentioned conditions which comprisesadministering to a subject an effective amount of a compound of thedisclosure or a pharmaceutical composition thereof.

Compounds described herein may also be used in the manufacture of amedicament for the treatment of one or more of the above-identifieddiseases.

The word “treatment” is intended to embrace prophylaxis as well astherapeutic treatment.

A compound of the disclosure may also be administered in combinationwith one or more other active ingredients e.g. active ingredientssuitable for treating the above mentioned conditions. For examplepossible combinations for treatment of respiratory disorders includecombinations with steroids (e.g. budesonide, beclomethasonedipropionate, fluticasone propionate, mometasone furoate, fluticasonefuroate), beta agonists (e.g. terbutaline, salbutamol, salmeterol,formoterol, indacaterol) and/or xanthines (e.g. theophylline),musacarinic antagonists, (e.g. ipratropium) and/or a p38 MAP kinaseinhibitor.

In one embodiment a compound of the disclosure is administered incombination with an antiviral agent, for example acyclovir, tamiflu,relenza or interferon.

In one embodiment the combination of active ingredients areco-formulated.

In one embodiment the combination of active ingredients is simplyco-administered.

EXPERIMENTAL SECTION Abbreviations

Abbreviations used herein have the meanings defined in the table below.Any abbreviations appearing in the text which have not been defined areintended to covey their generally accepted meaning.

AcOH glacial acetic acid Aq aqueous Ac Acetyl ATPadenosine-5′-triphosphate BALF bronchoalveolae lavage fluid Boctert-buto)rycarbonyl Br Broad BSA bovine serum albumin CDI1,1-carbonyl-diimidazole COPD chronic obstructive pulmonary disease DDoublet DCM dichloromethane DIAD diisopropylazadicarboxylate DIBAL-Hdiisobutylaluminium hydride DIPEA N,N-diisopropylethylamine DMFN,N-dimethylformamide DMSO dimethyl sulfoxide dppf1,1′-bis(diphenylphosphino)ferrocene EDC1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (ES⁺) electrosprayionization, positive mode Et Ethyl Et₂O diethyl ether Et₃N triethylamineEtOH Ethanol EtOAc ethyl acetate FACS fluorescence-activated cellsorting FCS foetal calf serum G gram(s) HOBt 1-hydroxybenzotriazole HPLChigh performance liquid chromatography HPLC-MS high performance liquidchromatography mass spectrometry Hr hour(s) HRP horseradish peroxidasei-n intra-nasal i-t intra-tracheal KHMDS potassium hexamethyldisilazaneμL microliter(s) LPS lipopolysaccharide μM micromolar Mm micro metre MMolar (M + H)+ protonated molecular ion Me Methyl MeOH methanol MeODdeuterated methanol Mg milligram(s) MHz megahertz Min minute(s) mLmillilitre(s) mM millimolar Mm millimetre mmol millimole(s) MTT3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide m/zmass-to-charge ratio Ng nanogram Nm nanomolar Nm nanometre NMP1-methylpyrrolidin-2-one (N-methyl-2-pyrrolidone) NMR nuclear magneticresonance (spectroscopy) PBS phosphate buffered saline Pd₂(dba)₃tris(dibenzylideneacetone)dipalladium(0) Ph Phenyl PIP2phosphatidylinositol 4,5-biphosphate PIP3 phosphatidylinositol3,4,5-triphosphate PMA phorbol myristate acetate Po by oraladministration PPh₃ triphenylphosphine PyBOP ®(benzotriazol-1-yloxy)tripyrrolidinophosphonium hexafluorophosphate QQuartet Quin Quintet R^(t) retention time RT room temperature RP HPLCreverse phase high performance liquid chromatography S Singlet SCX solidsupported cation exchange (resin) SDS sodium dodecyl sulfate T TripletTBAF tetrabutylammonium fluoride TBDMSCI tert-butyldimethylsilylchloride TFA trifluoroacetic acid THF tetrahydrofuran TLC thin-layerchromatography TMB 3,3′,5,5′-tetramethylbenzidine TNF 

  tumour necrosis factor alpha TR-FRET time-resolved fluorescenceresonance energy transfer Vol Volume VT Variable temperature W Watts

General Procedures

Those intermediates and bespoke chemical building blocks not availablefrom commercial sources were prepared according to the proceduresdisclosed herein or using the cited literature methods. All otherstarting materials and solvents (HPLC grade) were obtained fromcommercial sources and were used without further purification Whereindicated reactions were degassed by passing a stream of nitrogenthrough them for at least 10 min. Microwave reactions were carried outusing a CEM Discover or Explorer focussed microwaves apparatus. Organicsolutions were dried using magnesium sulphate or sodium sulphate. Flashcolumn chromatography was performed using a minimum of 20 massequivalents of silica with SiliCycle SiliaFlash® P60 (230-400 mesh) or aBiotage Isolute SPE Column prepacked with Flash Si II.

Analytical Methods

Thin-layer chromatography (TLC) analysis was performed with Kieselgel 60with fluorescence indicator UV₂₅₄ plates and visualized using UV lightor stained with standard TLC dips or iodine.

Reverse Phase Analytical High Performance Liquid Chromatography-MassSpectrometry:

All samples were routinely analysed by HPLC-MS using the instrumentationand conditions described below. Unless stated otherwise final compoundwere subject to analysis using Method B and intermediates were analysedutilising Method A.

Method A was performed on Agilent HP1100 and Shimadzu 2010, systemsusing reverse phase Atlantis dC18 columns (5 μ

m, 2.1×50 mm), gradient 5-100% B (A=water/0.1% formic acid,B=acetonitrile/0.1% formic acid) over 3 min, injection volume 3 μL,flow=1.0 mL/min. UV spectra were recorded at 215 nm using a Waters 2487dual wavelength UV detector or the Shimadzu 2010 system. Mass spectrawere obtained over the range m/z 150 to 850 at a sampling rate of 2scans per second using Waters ZMD or over m/z 100 to 1000 at a samplingrate of 2 Hz using electrospray ionisation, by a Shimadzu 2010 LC-MSsystem.

Method B was performed on Agilent HP1100 and Shimadzu 2010, systemsusing reverse phase Water Atlantis dC18 columns (3 μm, 2.1×100 mm),gradient 5-100% B (A=water/0.1% formic acid, B=acetonitrile/0.1% formicacid) over 7 min, injection volume 3 μL, flow=0.6 mL/min. UV spectrawere recorded at 215 nm using a Waters 2996 photo diode array or on theShimadzu 2010 system. Mass spectra were obtained over the range m/z 150to 850 at a sampling rate of 2 scans per second using Waters ZQ or overm/z 100 to 1000 at a sampling rate of 2 Hz using electrosprayionisation, by a Shimadzu 2010 LC-MS system.

Method C was performed on Agilent HP1100, systems using reverse phasePhenomenex Gemini dC18 columns (3 μm, 2.0×50 mm), gradient 1-100% B (A=2mM ammonium bicarbonate pH10, B=acetonitrile) over 3.5 min, injectionvolume 3 μL, flow=1.0 mL/min. UV spectra were recorded at 215 nm using aWaters 2487 dual wavelength UV detector or a Waters 2996 photo diodearray. Mass spectra were obtained over the range m/z 150 to 850 at asampling rate of 2 scans per second using Waters ZMD or a Waters ZQ.

Method D: was performed on Agilent HP1200, systems using Agilent ExtendC18 columns, (1.8 μm, 4.6×30 mm) at 40° C. and a flow rate of 2.5-4.5 mLmin⁻¹, eluting with a H₂O-MeCN gradient containing 0.1% v/v formic acidover 4 min. Gradient information: 0-3.00 min, ramped from 95% H₂O—5%MeCN to 5% H₂O—95% MeCN; 3.00-3.01 min, held at 5% H₂O—95% MeCN, flowrate increased to 4.5 mL·min⁻¹; 3.01-3.50 min, held at 5% H₂O—95% MeCN;3.50-3.60 min, returned to 95% H₂O—5% MeCN; flow rate reduced to 3.50 mLmin⁻¹; 3.60-3.90 min, held at 95% H₂O—5% MeCN; 3.90-4.00 min, held at95% H₂O—5% MeCN, flow rate reduced to 2.5 mL·min⁻¹. UV detection wasperformed at 254 nm using an Agilent G1314B variable wavelengthdetector. Mass spectra were obtained over the range m/z 60 to 2000 at asampling rate of 1.6 sec/cycle using an Agilent G1956B.

Chiral Stationary Phase Analytical HPLC was performed using Deicelcolumns (5 μm×5 cm×4.6 mm) containing one of the following stationaryphases: Chiralpak AD-H, Chiralcel OD-H, Chiralcel OJ-H, and ChiralpakAS-H. A flow rate of 1 mL/min, was used eluting under isocraticconditions over 6 to 20 min, with one of the following mobile phases:70:30 heptane:IPA (v/v), 85:15 heptane:EtOH (v/v), 50:50 MeOH:EtOH(v/v), and acetonitrile; employing UV detection at 254 nm. Each of thesemobile phase are compatible with the column packings referred to above,providing sixteen different solvent and stationary phase permutations.Modifers such as triethylamine (0.1%), formic acid (0.1%) may be addedto improve the resolution

Semi-preparative Chiral Stationary Phase LC-UV was performed on a Gilsonpreparative modular system using a Deicel Chiralpak AD semi-prep column(10 mm, 20×250 mm) and a flow rate of 18 mL/min eluting with anisocratic method over 20 min using 70:20 heptane:IPA and 0.1%triethylamine employing an injection volume of 1.0 mL. UV spectra wererecorded and fractions analysed for collection at 215 nm with a Gilson119 UV detector.

Data were integrated and reported using OpenLynx and OpenLynx Browsersoftware or via Shimadzu PsiPort software.

¹H NMR Spectroscopy: spectra were acquired on a either a Bruker DPX 250MHz, a Bruker Avance III 400 MHz or a Bruker DRX 500 MHz spectrometerusing residual protonated resonances of the deuterated solvent as theinternal reference

Preparation of Non Commercial Intermediates3-(3-(tert-Butyldimethylsilyloxy)phenyl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine(3)

To a stirred suspension of 3-iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine(1) (8.22 g, 31.5 mmol), 3-phenol boronic acid (13.0 g, 94.5 mmol) andpotassium phosphate (10.0 g, 47.3 mmol) in degassed DMF/water (3:2, 140mL) was added [dppf] palladium (II) dichloride (13.0 g, 15.7 mmol). Thereaction mixture was flushed with nitrogen, heated at 120° C. for 2 hrand then allowed to cool to RT. The reaction mixture was diluted withEtOAc (500 mL) and aqueous hydrochloric acid (2 M, 500 mL) and theresulting suspension was filtered. The filtrate was extracted withaqueous hydrochloric acid (2 M, 2×500 mL). The combined aqueous extractswere basified with a saturated aq solution of sodium carbonate to pH 10.The precipitate formed was filtered and the filtrate was extracted withEtOAc (3×1 L). The combined organic extracts were dried, filtered andthe solvent removed in vacuo to afford a grey solid. All solid materialsgenerated during the workup procedure were combined and triturated withDCM to afford 3-(4-amino-1H-pyrazolo[3,4-d]pyrimidin-3-yl)phenol (2)(6.04 g, 84%) as a grey solid: m/z 228 (M+H)⁺ (ES⁺).

To a stirred solution of compound (2) (4.69 g, 20.66 mmol) and imidazole(2.10 g, 30.99 mmol) in dry DMF (100 mL) was added TBDMSCI (4.70 g,30.99 mmol). After 16 hr, further aliquots of imidazole (2.10 g, 30.99mmol) and TBDMSCI (4.70 g, 30.99 mmol) were added and the mixture wasstirred for 48 hr. The reaction mixture was diluted with water (120 mL)and extracted with DCM (2×200 mL). The combined organic extracts werewashed with water (2×200 mL), dried, filtered and the volume reduced toapproximately 100 mL by evaporation in vacuo. The resulting slurry wasfiltered and the solid washed with heptane (50 mL) to afford the titlecompound (3) (6.05 g, 85%) as an off-white solid: m/z 343 (M+H)⁺ (ES⁺).

3-(4-(tert-Butyldimethylsilyloxy)phenyl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine(5)

To a stirred suspension of 3-iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine(1) (10.0 g, 38.4 mmol), [dppf] palladium (II) dichloride (1.37 g, 1.92mmol) and 4-phenol boronic acid (15.8 g, 115.2 mmol) in DMF (90 mL) wasadded aq sodium hydroxide (1 M, 76.0 mL, 76.8 mmol). The reaction wasflushed with nitrogen and heated at 120° C. for 18 hr. The reactionmixture was allowed to cool to RT and diluted with water (200 mL). Theresulting precipitate was collected by filtration and washed with water(200 mL) and then DCM, until the filtrate ran colourless, to afford4-(4-amino-1H-pyrazolo[3,4-d]pyrimidin-3-yl)phenol (4) (5.25 g, 60%) asa brown solid: m/z 228 (M+H)⁺ (ES⁺).

To a stirred solution of compound (4) (5.25 g, 23.1 mmol) and imidazole(3.85 g, 57.8 mmol) in dry DMF (70 mL) was added TBDMSCI (4.19 g, 27.7mmol). After 16 hr, further aliquots of imidazole (1.93 g, 28.9 mmol)and TBDMSCI (2.10 g, 13.9 mmol) were added and the mixture stirred for 4hr. The reaction mixture was diluted with water (200 mL) and theresulting precipitate was collected by filtration, washed with water(200 mL) and heptane (300 mL) to afford the title compound (5) (7.31 g,93%) as a brown solid: m/z 344 (M+H)⁺ (ES⁺).

5-bromo-3-(2-chlorobenzyl)-2-(chloromethyl)quinazolin-4(3H)-one (8)

To a stirred solution of 2-amino-6-bromo-benzoic acid (6) (3.06 g, 14.2mmol) in toluene (75 mL) cooled to 0° C. in an ice-bath was addedpyridine (0.60 mL, 7.10 mmol) followed by a solution of chloroacetylchloride (2.26 mL, 28.4 mmol) in toluene (75 mL) drop-wise over 1 hr.The reaction mixture was allowed to warm to RT, and was heated at 115°C. for 3 hr and then allowed to cool to RT. The solvent volume wasreduced by half by evaporation in vacuo. Upon standing overnight, theproduct precipitated and was collected by filtration to afford2-bromo-6-(2-chloroacetamido)benzoic acid (7a) (1.44 g) as a whitesolid: m/z 290/292 (M+H)⁺ (ES⁺). The filtrate was concentrated in vacuoand the residue triturated with ethanol/heptane to afford2-bromo-6-(2-hydroxyacetamido) benzoic acid (7b) (1.02 g, combinedyield, 59%): m/z 274/276 (M+H)⁺ (ES⁺). Both 7a and 7b can be usedwithout further purification in the next step.

To a stirred mixture of compound (7a) (7.50 g, 27.4 mmol),2-chlorobenzylamine (5.00 mL, 41.05 mmol) and triethylamine (5.70 mL,41.1 mmol) in toluene (250 mL) was added a solution of phosphorustrichloride (2.60 mL, 30.1 mmol) in toluene (250 mL) dropwise over 1 hr.The reaction mixture was heated to 110° C. for 24 hr, whereupon the hotsolution was decanted and concentrated in vacuo. The residue wastriturated with propan-2-ol (50 mL) to afford the title compound (8)(6.41 g, 59%) as a yellow solid: m/z 397/399 (M+H)⁺ (ES⁺).

3-(2-(2-Methoxyethoxy)ethoxy)prop-1-yne (9)

To a stirred suspension of sodium hydride (3.12 g, 78.0 mmol) in THF(100 mL) cooled to 5° C. in an ice-bath was added a solution ofpropargyl alcohol (4.60 g, 78.0 mmol) in THF (20 mL) drop-wise. Themixture was stirred at 5° C. for 30 min and was then allowed to warm toRT and treated dropwise with 1-bromo-2-(2-methoxyethoxy)ethane (7.00 mL,52.0 mmol). The reaction mixture was stirred at RT for 16 hr and wasthen, diluted with water (100 mL) and extracted with diethyl ether(2×100 mL). The combined organic extracts were dried, filtered andevaporated in vacuo. The residue was purified by flash columnchromatography, eluting with 30% EtOAc in heptane, to afford the titlecompound (9) (250 mg, 9%) as a colourless oil: ¹H NMR (500 MHz, MeOD) δ:4.18 (2H, d), 3.66-3.69 (2H, m), 3.60-3.66 (4H, m), 3.52-3.56 (2H, m),3.36 (3H, s), 2.84 (1H, t).

2-(2-(Prop-2-ynyloxy)ethoxy)ethanol (10)

To a stirred suspension of potassium tert-butoxide (1.06 g, 9.42 mmol)in THF (300 mL) cooled to 0° C. in an ice-bath was added a solution of2,2′-oxydiethanol (4.60 g, 78.0 mmol) in THF (10 mL). The mixture wasstirred at 0° C. for 30 min and was then allowed to warm to RT and wastreated dropwise with propargyl bromide (1.68 mL of an 80% solution intoluene, 11.30 mmol). The reaction mixture was stirred at RT for 16 hrand diluted with brine and water (5:1, 50 mL) and was extracted withEtOAc (3×500 mL). The combined organic extracts were dried, filtered andevaporated in vacuo. The residue was purified by flash columnchromatography, eluting with 25 to 60% EtOAc in heptane, to afford thetitle compound (10) (410 mg, 30%) as a yellow oil: ¹H NMR (250 MHz,CDCl₃) δ: 2.22 (1H, s), 2.45 (1H, t), 3.58-3.66 (2H, m), 3.67-3.79 (6H,m), 4.22 (2H, d).

1-Morpholinohex-5-yn-1-one (11)

To a solution of hex-5-ynoic acid (500 mg, 4.46 mmol), DMAP (27 mg, 0.23mmol) and EDC hydrochloride (940 mg, 4.90 mmol) in DCM (10 mL) was addedmorpholine (391 μL, 4.46 mmol). The reaction was stirred at RT overnightand then diluted with DCM (50 mL). The resulting solution was washedwith water (3×10 mL), brine (10 mL) and aq hydrochloric acid (2 M, 2×20mL) and was then dried, filtered and evaporated in vacuo to afford thetitle compound (11) (808 mg, 100%) as a yellow oil: ¹H NMR (500 MHz,CDCl₃) δ: 3.65-3.71 (4H, m), 3.63 (2H, d), 3.45-3.54 (2H, m), 2.46 (2H,t), 2.26-2.33 (2H, m), 1.98 (1H, t), 1.88 (2H, quin).

2-Acetamido-N-(prop-2-ynyl)acetamide (12)

To a solution of N-acetylglycine (200 mg, 1.71 mmol), DMAP (11 mg, 0.09mmol) and EDC hydrochloride (360 mg, 1.88 mmol) in DCM (10 mL) was addedpropargylamine (109 μL, 1.71 mmol). The reaction mixture was stirred atRT overnight and then evaporated in vacuo. The residue was purified byflash column chromatography, eluting with 0 to 5% methanol in DCM, toafford the title compound (12) (218 mg, 83%) as a white solid: ¹H NMR(500 MHz, CDCl₃) δ: 2.07 (3H, s), 2.25 (1H, t), 3.95 (2H, d), 4.07 (2H,dd), 6.34 (1H, br s), 6.49 (1H, b s).

N-(But-3-ynyl)morpholine-4-carboxamide (13)

To a suspension of but-3-yn-1-amine hydrochloride (200 mg, 1.89 mmol)and triethylamine (425 μL, 3.78 mmol) in DCM (60 mL) was addedmorpholine-4-carbonyl chloride (218 μL, 1.89 mmol). The reaction wasstirred at RT overnight and then washed with aq hydrochloric acid (2 M,2×20 mL), saturated aq sodium bicarbonate (2×20 mL), dried, filtered andevaporated in vacuo. The residue was purified by flash columnchromatography, eluting with 0-100% ethyl acetate in heptane, to affordthe title compound (13) (164 mg, 48%) as a white solid. ¹H NMR (500 MHz,DMSO-d₆) δ: 2.28 (2H, td), 2.82 (1H, t), 3.09-3.18 (2H, m), 3.20-3.27(4H, m), 3.48-3.57 (4H, m), 6.74 (1H, t).

(2-Fluoro-3-methoxyphenyl)methanamine (15)

To a stirred solution of sodium hydrogen carbonate (2.73 g, 32.5 mmol)in water (50 mL) was added hydroxylamine hydrochloride (2.30 g, 33.2mmol) in portions over 30 min. The resultant solution was added to avigorously stirred suspension of 2-fluoro-3-methoxybenzaldehyde (5.00 g,32.5 mmol) in ethanol (45 mL) and the reaction mixture stirred at RT for16 hr. The resultant precipitate was removed by filtration and washedwith water (3×100 mL) and then allowed to dry in air to afford2-fluoro-3-methoxybenzaldehyde oxime (14) (4.69 g, 85%) as a whitecrystalline solid: m/z 170 (M+H)⁺ (ES⁺).

To a stirred solution of the oxime (14) (1.50 g, 8.86 mmol) in ethanol(70 mL) under nitrogen was added 10% palladium on carbon (100 mg). Thereaction mixture was placed under an atmosphere of hydrogen and stirredat RT for 2 hr. The reaction mixture was filtered through Celite™, andwas then evaporated in vacuo to remove the ethanol. The resultant cruderesidue was partitioned between ethyl acetate (50 mL) and aqhydrochloric acid (2 M, 50 mL). The aq layer was separated and wasneutralised with saturated sodium hydrogen carbonate solution and thenre-extracted with ethyl acetate (70 mL) followed by a mixture of2-propanol and chloroform (1:1, 2×70 mL). The propanol/chloroformextracts were dried, filtered and evaporated in vacuo separately toafford the title compound (15) in two batches (batch 1: 346 mg, 25%;batch 2: 370 mg, 27%) as white solids: m/z 156 (M+H)⁺ (ES⁺) (method C).

2-((4-amino-3-iodo-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-bromo-3-(2-chlorobenzyl)quinazolin-4(3H)-one: Intermediate A

To a stirred mixture of5-bromo-3-(2-chlorobenzyl)-2-(chloromethyl)quinazolin-4(3H)-one, (8),(13.6 g, 30.7 mmol) and 3-iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine (1)(8.09 g, 30.7 mmol) in DMF (300 mL was added potassium carbonate (6.36g, 46.0 mmol) and the reaction maintained at RT in the dark for 24 hr.The mixture was poured onto water (4.0 L) and the resulting suspensionwas stirred at RT for 1 hr. The precipitate was isolated by filtrationand dried in vacuo to afford the title compound, Intermediate A, as acolourless solid (18.0 g, 94%); m/z 622/624 [M+H]⁺ (ES⁺).

2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-bromo-3-(2-chlorobenzyl)quinazolin-4(3H)-one:Intermediate B

To a stirred mixture of compound (8) (100 mg, 0.25 mmol) and potassiumcarbonate (42 mg, 0.30 mmol) in DMF (2.5 mL) was added a solution ofcompound (3) (94 mg, 0.28 mmol) in DMF (2.5 mL) and the reaction mixturewas stirred at RT for 18 hr. Potassium carbonate (3×35 mg, 0.75 mmol)was added in three portions over 30 hr. The solvent was removed in vacuoand the crude material was purified by flash column chromatography,eluting with 4.5% methanol in DCM, to afford the title compound(Intermediate B) (94 mg, 64%) as a off-white solid: m/z 588/590 (M+H)⁺(ES⁺) (Method B).

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-bromo-3-(2-chlorobenzyl)quinazolin-4(3H)-one:Intermediate C

Route A:

A thoroughly ground mixture of Intermediate A (10.0 g, 15.3 mmol),Na₂CO₃.10H₂O (9.60 g, 33.6 mmol), 4-hydroxyphenylboronic acid (4.21 g,30.5 mmol), and Pd(Ph₃)₄ (1.32 g, 1.14 mmol) in EtOH (300 mL) was purgedwith nitrogen and was then stirred at 85° C. for 3 days. The mixture wascooled to RT and the precipitate was isolated by filtration and waswashed with EtOH (100 mL). The solid was resuspended in water (100 mL)and was stirred for a further 30 min was then isolated by filtration,washed with EtOH (50 mL) and dried in vacuo to afford the titlecompound, Intermediate C as an off white solid (4.86 g, 51%); m/z588/590 (M+H)⁺ (ES⁺).

Route B:

To a stirred mixture of compound (8) (100 mg, 0.25 mmol) and potassiumcarbonate (42 mg, 0.30 mmol) in DMF (2.5 mL) was added a solution ofcompound (5) (94 mg, 0.28 mmol) in DMF (2.5 mL) and the reaction mixturestirred at RT for 18 hr. The solvent was removed in vacuo and the crudematerial was purified by flash column chromatography, eluting with 4.5%methanol in DCM, to afford the title compound, Intermediate C (82 mg,55%) as a cream solid: m/z 588/590 (M+H)⁺ (ES⁺) (Method B).

2-((4-Amino-3-(3-fluoro-4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-bromo-3-(2-chlorobenzyl)quinazolin-4(3H)-one:Intermediate D

To a stirred mixture of compound (8) (200 mg, 0.502 mmol) and potassiumcarbonate (83 mg, 0.60 mmol) in DMF (2.0 mL) was added a solution of4-(4-amino-1H-pyrazolo[3,4-d]pyrimidin-3-yl)-2-fluorophenol (see Table1, below) (148 mg, 0.602 mmol) in DMF (2.0 mL) and the reaction mixturestirred at RT for 18 hr. The solvent was removed in vacuo and the crudematerial was purified by flash column chromatography, eluting with 5%methanol in DCM, to afford the title compound, Intermediate D (81 mg,27%) as a off-white solid: m/z 606/608 (M+H)⁺ (ES⁺) (Method B).

2-((4-Amino-3-(4-hydroxy-3-methoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-bromo-3-(2-chlorobenzyl)quinazolin-4(3H)-one:Intermediate E

A mixture of Intermediate A (400 mg, 0.630 mmol),2-methoxy-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenol (189 mg,0.755 mmol), Na₂CO₃.10H₂O (396 mg, 1.39 mmol) and Pd(Ph₃)₄ (55 mg, 0.047mmol) in EtOH (12 mL) was purged with nitrogen and was then stirred at85° C. for 24 hr. The mixture was cooled and was evaporated in vacuo andthe residue was purified by flash column chromatography (SiO₂, 80 g,MeOH in CH₂Cl₂, 0-10%, gradient elution) to afford the title compound,Intermediate E, as a pale brown solid (225 mg, 56%); m/z 618/620 (M+H)⁺(ES⁺).

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(5-iodopent-1-ynyl)quinazolin-4(3H)-one:Intermediate F

To a mixture of Intermediate C (503 mg, 0.854 mmol), copper(I) iodide(17 mg, 0.089 mmol) and bis(triphenylphosphine)palladium(II) dichloride(64 mg, 0.089 mmol) in diethylamine (3.2 mL, 31 mmol) was addedpent-4-yn-1-ol (157 μL, 1.70 mmol). The reaction mixture was de-gassedwith N₂ and was heated at 60° C. for 2.5 hr and then cooled to RT. Theresulting mixture was evaporated in vacuo and the residue was trituratedwith EtOAc (5.0 mL) and dried in vacuo to afford2-((4-amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(5-hydroxpent-1-ynyl)quinazolin-4(3H)-one(16) as a brown solid (488 mg, 92% pure, 89%); m/z 590/592 (M+H)⁺ (ES⁺)(Method D).

To a stirred suspension of the alcohol (16) (162 mg, 92% pure, 0.252mmol) in DCM (8.0 mL) was added iodine (121 mg, 0.477 mmol),triphenylphosphine (115 mg, 0.438 mmol) and imidazole (35 mg, 0.51 mmol)and the mixture maintained at RT for 2 hr. The reaction mixture wasevaporated in vacuo and the residue was purified by flash columnchromatography (SiO₂, 40 g, MeOH in DCM, 0-10%, gradient elution) toafford Intermediate F (109 mg, 73% pure, 45.0%) as a yellow solid m/z702/704 (M+H)⁺ (ES⁺) (Method D), which was used without furtherpurification in subsequent transformations.

Additional intermediates and non-commercial building blocks, that appearin the reaction schemes which follow, were prepared using the proceduresdescribed above for analogous derivatives or by the methods described inthe cited literature references (Table 1).

TABLE 1 Non Commercial Compounds Literature Citation or StructureCompound Name Analogous Procedure

4-(4-amino-1H-pyrazolo[3, 4-d]pyrimidin-3-yl)-2- fluorophenol Preparedusing procedures for (1) → (4) starting from 3-fluoro-4-phenol boronicacid

3-(3-(tert-butyldimethyl- silyloxy)-4-fluorophenyl)- 1H-pyrazolo[3,4-d]pyrimidin-4-amine Prepared using the methodology for (1) → (2) → (3)starting from 4- fluoro-3-phenol boronic acid

2-((4-amino-3-(4-fluoro- 3-hydroxyphenyl)-1H- pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-bromo-3- (2-chlorobenzyl) quinazolin-4(3H)-one Preparedusing the methodology for (Inter- mediate D) starting from3-(3-(tert-butyl dimethyl- silyloxy)-4-fluorophenyl)- 1H-pyrazolo[3,4-d]pyrimidin-4-amine

4-(2-(prop-2-yn-1-yloxy)- ethyl)morpholine Gautier et al., AnnalesPharmaceutiques Francaises, 1971, 29, 39-50

3-(2-methoxyethoxy)prop- 1-yne Prepared using the procedure for compound(9) starting from 2-bromo- ethyl methyl ether

N-(2-methoxyethyl)hex- 5-ynamide Prepared using the procedure forcompound (11) substituting 2- methoxyethanamine

1-morpholinohept-6-yn- 1-one Prepared using the procedure for compound(11) from hept-6-ynoic acid

1-morpholinopent-4-yn- 1-one Prepared using the procedure for compound(11) from pent-4-ynoic acid

1-(piperidin-1-yl)hex-5- yn-1-one Prepared using the procedure forcompound (11) substituting piperidine

N,N-diethylhex-5-ynamide Prepared using the procedure for compound (11)substituting diethyl- amine

1-(4-methylpiperazin-1- yl)hex-5-en-1-one Prepared using the procedurefor compound (11) substituting 4- methylpiperazine

1-(4-morpholinopiperidin- 1-yl)hex-5-yn-1-one Prepared using theprocedure for compound (11) substituting 4- morpholinopiperidine

1-(4-acetylpiperazin-1-yl)- hex-5-yn-1-one Prepared using the procedurefor compound (11) substituting 4- acetylpiperazine

N-(2-morpholinoethyl)- hex-5-ynamide Prepared using the procedure forcompound (11) substituting 2- morpholinoethanamine

N-(tetrahydro-2H-pyran- 4-yl)hex-5-ynamide Prepared using the procedurefor compound (11) substituting tetra- hydro-2H-pyran-4-amine

N-(2-(dimethylamino)-ethyl)- hex-5-ynamide Prepared using the procedurefor compound (11) substituting N′,N′- dimethylethane-1,2- diamine

tert-butyl 4-(hex-5-yn- amidomethyl)piperidine- 1-carboxylate Preparedusing the procedure for compound (11) substituting tert-butyl4-(aminoethyl)piperidine- 1-carboxylate

(R)-1-(3-(dimethylamino)- pyrrolidin-1-yl)hex-5-yn- 1-one Prepared usingthe procedure for compound (11) substituting (R)-N,N-dimethylpyrrolidin- 3-amine

tert-butyl 3-(hex-5-ynamido) pyrrolidine-1-carboxylate Prepared usingthe procedure for compound (11) substituting tert-butyl3-aminopyrrolidine-1- carboxylate

1-(4-(bis(2-methoxyethyl)- amino)piperidin-1-yl)hex- 5-yn-1-one Preparedusing the procedure for compound (11) substituting bis(2-methoxyethyl)amine

1-(4-methyl-1,4-diazepan- 1-yl)hex-5-yn-1-one Prepared using theprocedure for compound (11) substituting 1-methyl- 1,4-diazepane

1-(4-dimethylamino)- piperidin-1-yl)hex-5-yn- 1-one Prepared using theprocedure for compound (11) substituting 4- dimethylaminopiperidine

1-(4-(2-methoxyethyl)- piperazin-1-yl)hex-5-yn- 1-one Prepared using theprocedure for compound (11) substituting 1-(2- methoxyethyl)piperazine

N-isopropylhex-5-ynamide Prepared using the procedure for compound (11)substituting propan- 2-amine

N-(pyridin-4-yl)hex-5- ynamide Prepared using the procedure for compound(11) substituting pyridin- 4-amine

N-cyclopentylhex-5- ynamide Prepared using the procedure for compound(11) substituting cyclo- pentanamine

N-(2-(4-methylpiperazin- 1-yl)ethyl)hex-5-ynamide Prepared using theprocedure for compound (11) substituting 2-(4- methylpiperazin-1-yl)-ethanamine

N-methyl-N-(2-(4-methyl- methylpiperazin-1-yl)- ethyl)hex-5-ynamidePrepared using the procedure for compound (11) substituting N-methyl-2-(4-methylpiperazin-1- yl)-ethanamine

3-((5-bromo-2-(chloro- methyl)-4-oxoquinazolin- 3(4H)-yl)methyl)benzo-nitrile, Compound (17) Prepared using the methodology employed togenerate compound (8) substituting 3-cyano- benzylamine hydrochloride inthe second step

3-((2-((4-amino-3-(3- hydroxyphenyl)-1H- pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-bromo-4- oxoquinazolin-3(4H)-yl)- methyl)benzonitrile;Compound (18) Prepared according to the methodology used to generateIntermediate B, substituting Compound (17)

COMPOUND EXAMPLES Example 1:2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-ethynylquinazolin-4(3H)-one

To a mixture of Intermediate A (91 mg, 0.15 mmol),(triisopropylsilyl)acetylene (87 μL, 0.39 mmol), copper (I) iodide (1.8mg, 0.01 mmol) and diethylamine (242 μL, 2.31 mmol) in degassed DMF (2.0mL) was added bis(triphenylphosphine)palladium (II) dichloride (6.5 mg,0.01 mmol). The reaction mixture was purged with nitrogen, sealed andthen heated under microwave irradiation (120° C., 200 W, CEM: Discovermicrowave) for 20 min. The mixture was cooled to RT, diluted with EtOAc(3 mL) and washed with water (1 mL). The aq phase was back extractedwith EtOAc (1.0 mL) and the combined organic extracts were washed withwater (1.0 mL). The aq phase was back extracted with EtOAc (1.0 mL) andthe combined organic extracts were washed with water (1.0 mL). The aqphase was back extracted with EtOAc (1.0 mL) and the combined organicextracts were washed with a saturated solution of aq ammonium chloride(2×2.0 mL) and then dried, filtered and evaporated in vacuo. The crudematerial was triturated with methanol (1.0 mL) and the resulting solidwas purified by flash column chromatography, eluting with 0 to 50%methanol in DCM, to afford2-((4-amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-((triisopropylsilyl)ethynyl)quinazolin-4(3H)-one(19) (107 mg, 100%) as a white solid: m/z 690/692 (M+H)⁺ (ES⁺).

To a stirred solution of compound (19) (107 mg, 0.15 mmol) in DMF (0.50mL) was added tetrabutylammonium fluoride (190 μL of a 1.0 M solution inTHF, 0.19 mmol). After 10 min, the reaction mixture was diluted withwater (3.0 mL) and cooled to 0° C. for 30 min. The resulting solid wascollected by filtration and purified by flash column chromatography,eluting with 4.5% methanol in DCM, to afford the title compound, Example1, (70 mg, 85%) as a white solid: m/z 534/536 (M+H)⁺ (ES⁺); R^(t) 3.73min; ¹H NMR (500 MHz, DMSO-d₆) δ: 4.42 (1H, s), 5.30 (2H, s), 5.77 (2H,s), 6.16 (1H, d), 6.79 (1H, t), 6.84 (1H, dd), 6.89-6.96 (2H, m), 7.04(1H, t), 7.14 (1H, d), 7.30 (1H, t), 7.70 (1H, d), 7.75 (1H, d),7.80-7.87 (1H, m), 8.18 (1H, s), 9.67 (1H, s).

Example 2:2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(3-(2-(2-methoxyethoxy)ethoxy)prop-1-yn-1-yl)quinazolin-4(3H)-one

To a mixture of Intermediate A (50 mg, 84.9 μmol), the acetylene (9) (20mg, 0.13 mmol), copper iodide (1.0 mg, 5.09 μmol) and diethylamine (133μL, 1.27 mmol) in degassed DMF (1.0 mL) was addedbis(triphenylphosphine)palladium(II) dichloride (3.6 mg, 5.09 μmol). Thereaction mixture was purged with nitrogen, sealed and then heated undermicrowave irradiation (120° C., 200 W, CEM: Discover microwave) for 20min. The mixture was cooled to RT and was diluted with water (10 mL) andextracted with EtOAc (2×20 mL). The combined organic extracts weredried, filtered and evaporated in vacuo. The residue was purified byflash column chromatography, eluting with 0-8% MeOH in DCM, to affordthe title compound, Example 2, (21 mg, 36%) as an orange solid: m/z 667(M+H)⁺ (ES⁺); R^(t) 3.68 min; ¹H NMR (500 MHz, DMSO-d₆) δ: 3.19 (3H, s),3.37 (2H, dd), 3.46 (2H, dd), 3.48-3.52 (2H, m), 3.59-3.64 (2H, m), 4.38(2H, s), 5.30 (2H, s), 5.76 (2H, s), 6.16 (1H, d), 6.76-6.81 (1H, m),6.84 (1H, dd), 6.89-6.95 (2H, m), 7.01-7.07 (1H, m), 7.13 (1H, d), 7.30(1H, t), 7.67 (1H, d), 7.73 (1H, d), 7.84 (1H, t), 8.17 (1H, s), 9.66(1H, s).

Example 3:2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one

To a mixture of Intermediate A (50 mg, 85 μmol), compound (11) (38 mg,212 μmol), copper iodide (1.0 mg, 5.1 μmol) and diethylamine (133 μL,1.27 mmol) in degassed DMF (2.0 mL) was addedbis(triphenylphosphine)palladium(II) dichloride (4.0 mg, 5.1 μmol). Thereaction mixture was purged with nitrogen, sealed and then heated undermicrowave irradiation (120° C., 200 W, CEM: Discover microwave) for 20min. The reaction mixture was concentrated and the residue was purifiedby flash column chromatography, eluting with 0-50% methanol in DCM, toafford the title compound, Example 3, (31 mg, 53%) as a white solid: m/z689/691 (M+H)⁺ (ES⁺), R^(t) 3.63 min; ¹H NMR (500 MHz, DMSO-d₆) δ:1.66-1.76 (2H, m), 2.45-2.55 (4H, m), 3.19-3.26 (2H, m), 3.28-3.36 (4H,m), 3.41-3.47 (2H, m), 5.29 (2H, s), 5.75 (2H, s), 6.14 (1H, d), 6.78(1H, t), 6.84 (1H, d) 6.89-6.94 (2H, m) 7.03 (1H, t) 7.11 (1H, d)7.26-7.33 (1H, m) 7.60 (1H, d) 7.68 (1H, d), 7.77-7.83 (1H, m), 8.18(1H, s), 9.68 (1H, s).

Example 4:6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)hex-5-ynoicacid

To a mixture of Intermediate C (150 mg, 0.25 mmol), hex-5-ynoic acid (69μL, 0.63 mmol), copper iodide (3.0 mg, 0.02 mmol) and diethylamine (400μL, 3.75 mmol) in degassed DMF (1.5 mL) was addedbis(triphenylphosphine)palladium(II) dichloride (11.0 mg, 0.02 mmol).The reaction mixture was purged with nitrogen, sealed and then heatedunder microwave irradiation (120° C., 200 W, CEM: Discover microwave)for 20 min. The mixture was cooled to RT, diluted with water (2.0 mL)and EtOAc (2.0 mL) and neutralised with 1 M aq hydrochloric acid to pH7. The suspension was concentrated and purified by flash columnchromatography, eluting with 0-50% methanol in DCM to afford the titlecompound, Example 4, (22 mg, 14%) as a yellow solid: m/z 620/622 (M+H)⁺(ES⁺); R^(t) 3.47 min; ¹H NMR (500 MHz, DMSO-d₆) δ: 1.68-1.78 (2H, m),2.29-2.41 (2H, m), 2.42-2.47 (2H, m), 5.29 (2H, s), 5.72 (2H, s), 6.19(1H, d), 6.79 (1H, t), 6.88 (2H, d), 7.03 (1H, t), 7.12 (1H, d), 7.32(2H, d), 7.60 (1H, d), 7.66 (1H, d), 7.78 (1H, t), 8.16 (1H, s), 9.73(1H, s), 12.04 (1H, s).

Example 5:2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one

To a solution of Example 4 (16.0 mg, 26 μmol), 4-dimethylaminopyridine(0.6 mg, 5.2 μmol), and EDC hydrochloride (5.3 mg, 28 μmol) in DMF (0.5mL) was added morpholine (2.3 μL, 26 μmol). The reaction mixture wasstirred at RT overnight and then diluted with water (5.0 mL). Theresulting solid was collected by filtration and purified by flash columnchromatography, eluting with 0-7% methanol in DCM to afford the titlecompound, Example 5, (7.0 mg, 57%) as a yellow solid: m/z 689/691 (M+H)⁺(ES⁺); R^(t) 3.54 min; ¹H NMR (500 MHz, DMSO-d₆) δ: 1.71 (2H, quin),2.43-2.49 (2H, m), 2.52-2.55 (2H, m), 3.20-3.26 (2H, m), 3.28-3.33 (4H,m), 3.44 (2H, t), 5.28 (2H, s), 5.72 (2H, s), 6.17 (1H, d), 6.78 (1H,t), 6.87 (2H, d), 7.02 (1H, t), 7.10 (1H, d), 7.32 (2H, d), 7.60 (1H,d), 7.67 (1H, d), 7.79 (1H, t), 8.16 (1H, s), 9.75 (1H, s).

Example 6:34(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-(3-(2-(2-hydroxyethoxy)ethoxy)prop-1-yn-1-yl)-4-oxoquinazolin-3(4H)-yl)methyl)benzonitrile

To a mixture of the aryl bromide (18), (see Table 1, above) (50 mg, 86μmol), the acetylene (10) (31 mg, 216 μmol), copper iodide (1.0 mg, 5.1μmol) and diethylamine (135 μL, 1.29 mmol) in degassed DMF (1.0 mL) wasadded bis(triphenylphosphine)palladium(II) dichloride (3.6 mg, 5.2μmol). The reaction mixture was purged with nitrogen, sealed and thenheated in the microwave (120° C., 200 W, CEM: Discover microwave) for 20min. The reaction mixture was concentrated and the residue was purifiedby flash column chromatography, eluting with 5.5% methanol in DCM, toafford the title compound, Example 6, (21 mg, 38%) as a white solid: m/z643 (M+H)⁺ (ES⁺), Rt (min) 3.22; ¹H NMR (500 MHz, DMSO-d6) δ: 3.37-3.40(2H, m), 3.41-3.47 (2H, m), 3.49-3.55 (2H, m), 3.62-3.67 (2H, m), 4.40(2H, s), 4.59 (1H, t), 5.37 (2H, s), 5.74 (2H, s), 6.81-6.86 (1H, m),6.89-6.97 (3H, m), 7.18 (1H, t), 7.22 (1H, s), 7.29 (1H, t), 7.51 (1H,d), 7.63-7.68 (2H, m), 7.77-7.83 (1H, m), 8.27 (1H, br s), 9.68 (1H, s).

Example 7:2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(5-(cyclopentylamino)pent-1-ynyl)quinazolin-4(3H)-one

To a suspension of Intermediate F (100 mg, 73% pure, 0.142 mmol) in DCM(10 mL) at RT was added cyclopentanamine (0.100 mL, 1.01 mmol). Thesuspension rapidly dissolved and the resulting solution was stirred atRT for 3 days then evaporated in vacuo. The residue was purified byflash column chromatography (SiO₂, 12 g, MeOH in EtOAc, 0-100%, gradientelution) and the crude product so obtained was triturated with MeCN toafford Example 7 as a yellow solid (16 mg, 17%); R^(t) 1.39 min; m/z659/661 (M+H)⁺ (ES⁺) (Method D); ¹H NMR (400 MHz, DMSO-d₆) δ: 1.22 (2H,m), 1.38 (2H, m), 1.50-1.64 (6H, overlapping m), 2.46 (2H, t), 2.60 (2H,t), 2.89 (1H, quin), 5.29 (2H, s), 5.73 (2H, s), 6.15 (1H, d), 6.77 (1H,td), 6.87 (2H, d), 7.02 (1H, m), 7.11 (1H, dd), 7.32 (2H, d), 7.58 (1H,dd), 7.67 (1H, dd), 7.78 (1H, m), 8.16 (1H, s), 9.77 (1H, br s).

Additional examples, set out below (Table 2), were prepared utilisingthe same synthetic methodologies as those disclosed above.

TABLE 2 Example No. Structure Name and Analytical Data 8

2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chloro-benzyl)-5-(3-(2-morpholinoethoxy)prop-1-ynyl)- quinazolin-4(3H)-one.R^(t) 2.89 min; m/z 677 (M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO- d₆) δ:2.31 (4H, br s), 2.43 (2H, br s), 3.45 (4H, t), 3.63 (2H, t), 4.37 (2H,s), 5.29 (2H, s), 5.76 (2H, s), 6.15 (1H, d), 6.78 (1H, t), 6.81-6.87(1H, m), 6.89-6.95 (2H, m), 7.03 (1H, t), 7.12 (1H, d), 7.30 (1H, t),7.65 (1H, d), 7.70-7.77 (1H, m), 7.80-7.89 (1H, m), 8.18 (1H, s), 9.67(1H, s). 9

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-ethynylquinazolin-4(3H)-one. R^(t) 3.64 min; m/z 534/536 (M + H)⁺(ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 4.41 (1H, s), 5.28 (2H, s), 5.74(2H, s), 6.16 (1H, d), 6.77 (1H, t), 6.87 (2H, d), 6.99-7.06 (1H, m),7.12 (1H, d), 7.32 (2H, d), 7.70 (1H, d), 7.75 (1H, dd), 7.80-7.87 (1H,m), 8.15 (1H, s), 9.76 (1H, s). 10

2-((4-Amino-3(3-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(3-chloro-benzyl)-5-ethynylquinazolin-4(3H)-one. R^(t) 3.73 min; m/z 534/536 (M +H)⁺ (ES⁺); ¹H NMR (500 MHz), DMSO-d₆) δ: 4.45 (1H, s), 5.36 (2H, s),5.75 (2H, s), 6.70 (1H, d), 6.81- 6.87 (2H, m), 6.92-6.98 (2H, m), 7.07(1H, t), 7.11-7.19 (1H, m), 7.30 (1H, t), 7.61 (1H, d), 7.66-7.70 (1H,m), 7.75-7.81 (1H, m), 8.23 (1H, s), 9.66 (1H, s). 11

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(3-chloro-benzyl)-5-ethynylquinazolin-4(3H)-one. R^(t) 3.65 min; m/z 534/536 (M +H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 4.44 (1H, s), 5.35 (2H, s), 5.71(2H, s), 6.69 (1H, d), 6.82 (1H, s), 6.87 (2H, d), 7.06 (1H, t),7.11-7.17 (1H, m), 7.33 (2H, d), 7.58-7.64 (1H, m), 7.68 (1H, d),7.75-7.82 (1H, m), 8.21 (1H, s), 9.80 (1H, br s). 12

2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(2-fluorobenzyl)quinazolin-4(3H)-one. R^(t) 3.63 min; m/z 518 (M + H)⁺(ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ : 4.42 (1H, s), 5.35 (2H, s), 5.78(2H, s), 6.35 (1H, t), 6.74 (1H, t), 6.81-6.87 (1H, m), 6.87-6.97 (3H,m), 7.10 (1H, q), 7.21- 7.36 (1H, m), 7.62-7.73 (2H, m), 7.76-7.85 (1H,m), 8.19 (1H, s), 9.67 (1H, s). 13

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(2-fluorobenzyl)quinazolin-4(3H)-one. R^(t) 3.54 min; m/z 518 (M + H)⁺(ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 4.42 (1H, s), 5.34 (2H, s), 5.76(2H, s), 6.35 (1H, t), 6.72 (1H, t), 6.84-6.93 (3H, m), 7.09 (1H, q),7.33 (2H, d), 7.64-7.74 (2H, m), 7.76-7.85 (1H, m), 8.17 (1H, s), 9.76(1H, s). 14

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(3-methoxybenzyl)quinazolin-4(3H)-one. R^(t) 3.37 min; m/z 530 (M + H)⁺(ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 3.60 (3H, s), 4.44 (1H, s), 5.35(2H, s), 5.70 (2H, s), 6.34 (1H, d), 6.40 (1H, s), 6.84-6.91 (1H, m),6.88 (2H, m), 7.00 (1H, t), 7.31-7.38 (2H, m), 7.55 (1H, d), 7.66 (1H,d), 7.75 (1H, t), 8.20 (1H, s), 9.75 (1H, s). 15

2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(3-methoxybenzyl)quinazolin-4(3H)-one. R^(t) 3.48 min; m/z 530 (M + H)⁺(ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 3.61 (3H, s), 4.44 (1H, s), 5.36(2H, s), 5.73 (2H, s), 6.34 (1H, d), 6.40 (1H, s), 6.68 (1H, dd),6.82-6.86 (1H, m), 6.93- 6.97 (2H, m), 7.00 (1H, t), 7.31 (1H, t), 7.55(1H, d), 7.67 (1H, d), 7.76 (1H, t), 8.22 (1H, s), 9.67 (1H, s). 16

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(3-(trifluoromethyl)benzyl)quinazolin-4(3H)-one. R^(t) 3.67 min; m/z 568(M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 4.43 (1H, s), 5.44 (2H, s),5.72 (2H, s), 6.82-6.94 (3H, m), 7.18- 7.27 (2H, m), 7.30 (2H, d), 7.43(1H, d), 7.64 (1H, d), 7.67-7.71 (1H, m), 7.75-7.84 (1H, m), 8.17 (1H,s), 9.75 (1H, s). 17

2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(3-(trifluoromethyl)benzyl)quinazolin-4(3H)-one. R^(t) 3.76 min; m/z 568(M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 4.44 (1H, s), 5.45 (2H, s),5.75 (2H, s), 6.82-6.86 (1H, m), 6.89- 6.94 (3H, m), 7.22-7.27 (2H, m),7.30 (1H, t), 7.44 (1H, d), 7.63 (1H, d), 7.68 (1H, d), 7.79 (1H, t),8.20 (1H, s), 9.67 (1H, s). 18

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(4-chloro-benzyl)-5-ethynylquinazolin-4(3H)-one. R^(t) 3.56 min; m/z 534/536 (M +H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 4.44 (1H, s), 5.32 (2H, s), 5.70(2H, s), 6.73 (2H, d), 6.88 (2H, d), 7.05 (2H, d), 7.33 (2H, d), 7.62(1H, d), 7.68 (1H, d), 7.75-7.84 (1H, m), 8.21 (1H, s), 9.78 (1H, br s).19

2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(4-(methylsulfonyl)benzyl)quinazolin-4(3H)-one. R^(t) 3.27 min; m/z 578(M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 2.99 (3H, s), 4.43 (1H, s),5.43 (2H, s), 5.76 (2H, s), 6.84 (1H, d), 6.89-6.99 (4H, m), 7.29 (1H,t), 7.56 (2H, d), 7.64-7.72 (2H, m), 7.77-7.85 (1H, m), 8.23 (1H, s),9.66 (1H, s). 20

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(4-(methylsulfonyl)benzyl)quinazolin-4(3H)-one. R^(t) 3.46 min; m/z 578(M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 2.99 (3H, s), 4.42 (1H, s),5.41 (2H, s), 5.74 (2H, s), 6.81-6.92 (4H, m), 7.30 (2H, d), 7.52 (2H,d), 7.69 (2H, d), 7.78-7.85 (1H, m), 8.22 (1H, s), 9.77 (1H, br s). 21

2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(4-(trifluoromethyl)benzyl)quinazolin-4(3H)-one. R^(t) 3.67 min; m/z 568(M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 4.44 (1H, s), 5.42 (2H, s),5.75 (2H, s), 6.81-6.86 (1H, m), 6.86- 6.90 (3H, m), 6.91 (1H, s), 7.29(1H, t), 7.32 (2H, d), 7.68 (2H, dd), 7.78-7.85 (1H, m), 8.23 (1H, s),9.65 (1H, s). 22

3-((2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-4-oxoquinazolin-3(4H)-yl)methyl)- benzonitrile. R^(t) 3.30 min;m/z 525 (M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 4.43 (1H, s), 5.35(2H, s), 5.72 (2H, s), 6.87 (2H, d), 6.95 (1H, d), 7.16 (1H, t), 7.19(1H, s), 7.32 (2H, d), 7.49 (1H, d), 7.64-7.72 (2H, m), 7.77- 7.84 (1H,m), 8.22 (1H, s), 9.76 (1H, br s). 23

2-((4-Amino-3(3-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(3-(methylsulfonyl)benzyl)quinazolin-4(3H)-one. R^(t) 3.2 min; m/z 578 (M +H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 3.16 (3H, s), 4.43 (1H, s), 5.47(2H, s), 5.75 (2H, s), 6.81-6.88 (2H, m), 6.91-6.97 (2H, m), 7.25 (1H,t), 7.30 (1H, t), 7.51 (1H, s), 7.62-7.67 (2H, m), 7.69 (1H, d),7.77-7.85 (1H, m), 8.21 (1H, s), 9.68 (1H, s). 24

3-((2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-4-oxoquinazolin-3(4H)-yl)methyl)- benzonitrile. R^(t) 3.57 min;m/z 525 (M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 4.43 (1H, s), 5.37(2H, s), 5.74 (2H, s), 6.84 (1H, dd), 6.89-6.94 (2H, m), 6.97 (1H, d),7.19 (1H, t), 7.23 (1H, s), 7.29 (1H, t), 7.52 (1H, d), 7.66 (1H, d),7.69 (1H, d), 7.77-7.83 (1H, m), 8.24 (1H, s), 9.67 (1H, br s). 25

2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(4-chloro-benzyl)-5-ethynylquinazolin-4(3H)-one. R^(t) 3.81 min; m/z 534/536 (M +H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 4.44 (1H, s), 5.34 (2H, s), 5.73(2H, s), 6.78 (2H, d), 6.85 (1H, dd), 6.90-6.97 (2H, m), 7.08 (2H, d),7.31 (1H, t), 7.60 (1H, d), 7.65-7.70 (1H, m), 7.75-7.80 (1H, m), 8.22(1H, s), 9.65 (1H, br s). 26

2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl-3-(4-chloro-benzyl)-5-(3-methoxyprop-1-ynyl)quinazolin- 4(3H)-one. R^(t) 3.78 min;m/z 578/580 (M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 3.34 (3H, s),4.34 (2H, s), 5.35 (2H, s), 5.73 (2H, s), 6.76 (2H, d), 6.85 (1H, dd),6.90-6.98 (2H, m), 7.07 (2H, d), 7.31 (1H, t), 7.59 (1H, d), 7.64 (1H,d), 7.73-7.82 (1H, m), 8.30 (1H, br s), 9.67 (1H, s). 27

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(3-methoxy-benzyl)-5-(3-methoxyprop-1-ynyl)quinazolin- 4(3H)-one. R^(t) 3.50 min;m/z 574 (M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 3.60 (3H, s), 4.34(2H, s), 5.36 (2H, s), 5.70 (2H, s), 6.32 (1H, d), 6.39 (1H, s), 6.67(1H, dd), 6.88 (2H, d), 6.99 (1H, t), 7.34 (2H, d), 7.54 (1H, d), 7.63(1H, d), 7.76 (1H, t), 8.26 (1H, br s), 9.75 (1H, s). 28

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chloro-benzyl)-5-(3-methoxyprop-1-ynyl)quinazolin- 4(3H)-one. R^(t) 3.63 min;m/z 578/580 (M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 3.30 (3H, s),4.30 (2H, s), 5.29 (2H, s), 5.74 (2H, s), 6.17 (1H, d), 6.77 (1H, t),6.87 (2H, d), 7.02 (1H, t), 7.11 (1H, d), 7.32 (2H, d), 7.67 (1H, d),7.71-7.75 (1H, m), 7.80-7.86 (1H, m), 8.16 (1H, br s), 9.76 (1H, s). 29

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(4-(trifluoromethyl)benzyl)quinazolin-4(3H)-one. R^(t) 3.70 min; m/z 568((M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d6) δ: 4.42 (1H, s), 5.40 (2H,s), 5.73 (2H, s), 6.79-6.90 (4H, m), 7.29 (2H, d), 7.27 (2H, d),7.67-7.72 (2H, m), 7.82 (1H, t), 8.22 (1H, s), 9.76 (1H, s). 30

2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chloro-benzyl)-5-(3-(2-methoxyethoxy)prop-1-ynyl)- quinazolin-4(3H)-one. R^(t)3.64 min; m/z 623/625 (M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO- d₆) δ: 3.18(3H, s), 3.42 (2H, dd), 3.62 (2H, dd), 4.37 (2H, s), 5.29 (2H, s), 5.74(2H, s), 6.16 (1H, d), 6.74-6.80 (1H, m), 6.87 (2H, d), 7.02 (1H, t),7.12 (1H, d), 7.32 (2H, d), 7.66 (1H, dd), 7.73 (1H, dd), 7.83 (1H, t),8.16 (1H, br s), 9.75 (1H, s). 31

2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-((5-methylisoxazol-3-yl)methyl)quinazolin-4(3H)- one. R^(t) 3.33 min; m/z505 (M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 2.26 (3H, s), 4.46 (1H,s), 5.37 (2H, s), 5.83 (2H, s), 5.92 (1H, s), 6.86 (1H, dd), 6.98-7.07(2H, m), 7.33 (1H, t), 7.50 (1H, d), 7.61-7.68 (1H, m), 7.74 (1H, t),8.25 (1H, s), 9.69 (1H, s). 32

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-((5-methylisoxazol-3-yl)methyl)quinazolin-4(3H)- one. R^(t) 3.25 min; m/z505 (M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 2.25 (3H, s), 4.45 (1H,s), 5.37 (2H, s), 5.80 (2H, s), 5.92 (1H, s), 6.90 (2H, d), 7.41 (2H,d), 7.50 (1H, d), 7.62-7.68 (1H, m), 7.70-7.80 (1H, m), 8.22 (1H, s),9.77 (1H, br s). 33

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(3-chloro-2-fluorobenzyl)-5-ethynylquinazolin-4(3H)-one. R^(t) 3.60 min; m/z 552/554(M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 4.42 (1H, s), 5.34 (2H, s),5.76 (2H, s), 6.24 (1H, t), 6.61- 6.74 (1H, m), 6.87 (2H, d), 7.22 (1H,t), 7.32 (2H, d), 7.66-7.75 (2H, m), 7.81-7.89 (1H, m), 8.19 (1H, s),9.76 (1H, br s). 34

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(2,6-difluoro-benzyl)-5-ethynylquinazolin-4(3H)-one. R^(t) 3.52 min; m/z 536 (M + H)⁺(ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 4.42 (1H, s), 5.41 (2H, s), 5.86(2H, s), 6.84-6.92 (4H, m), 7.20-7.31 (1H, m), 7.39 (2H, d), 7.49 (1H,d), 7.63 (1H, d), 7.72 (1H, t), 8.21 (1H, s), 9.79 (1H, br s). 35

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(4-chloro-2-fluorobenzyl)-5-ethynylquinazolin-4(3H)-one. R^(t) 3.59 min; m/z 552/554(M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 4.44 (1H, s), 5.32 (2H, s),5.77 (2H, s), 6.33-6.39 (1H, m), 6.87 (2H, d), 6.97 (1H, t), 7.11-7.19(1H, m), 7.35 (2H, d), 7.67-7.73 (2H, m), 7.82 (1H, t), 8.18 (1H, s),9.77 (1H, br s). 36

2-((4-Amino-3-(3-fluoro-4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-ethynylquinazolin-4(3H)-one. R^(t) 3.72 min; m/z 552/554(M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 4.46 (1H, s), 5.35 (2H, s),5.42 (2H, s), 6.88 (1H, d), 7.20 (1H, t), 7.31 (1H, t), 7.35-7.43 (3H,m), 7.51 (1H, d), 7.73 (1H, d), 7.77 (1H, d), 7.85 (1H, t), 8.21 (1H,s), 13.57 (1H, br s). 37

2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo-[3.4-d]pyrimidin-1-yl)methyl)-5-(3-methoxy-prop-1-ynyl)-3-(3-(trifluoromethyl)benzyl)- quinazolin-4(3H)-one. R^(t)4.22 min; m/z 612 (M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO- d₆) δ: 3.32(3H, s), 4.33 (2H, s), 5.45 (2H, s), 5.75 (2H, s), 6.81-6.86 (1H, m),6.87-6.94 (3H, m), 7.21-7.26 (2H, m), 7.29 (1H, t), 7.43 (1H, d), 7.64(2H, t), 7.79 (1H, t), 8.24 (1H, br s), 9.68 (1H, s). 38

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(4-fluorobenzyl)quinazolin-4(3H)-one. R^(t) 3.47 min; m/z 518 (M + H)⁺(ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 4.45 (1H, s), 5.34 (2H, s), 5.71(2H, s), 6.80-6.90 (6H, m), 7.34 (2H, d), 7.55- 7.62 (1H, m), 7.67 (1H,dd), 7.77 (1H, t), 8.21 (1H, s), 9.79 (1H, s). 39

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chloro-benzyl)-5-(3-cyclopentylprop-1-ynyl)quinazolin- 4(3H)-one. R^(t) 4.66min; m/z 616/618 (M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 1.21- 1.34(2H, m), 1.41-1.50 (2H, m), 1.51-1.61 (2H, m), 1.68-1.77 (2H, m),1.99-2.10 (1H, m), 2.41 (2H, d), 5.27 (2H, s), 5.73 (2H, s), 6.15 (1H,d), 6.77 (1H, t), 6.87 (2H, d), 6.99-7.05 (1H, m), 7.11 (1H, d), 7.32(2H, d), 7.58 (1H, d), 7.64- 7.70 (1H, m), 7.75-7.82 (1H, m), 8.16 (1H,br s), 9.77 (1H, s). 40

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1yl)methyl)-5-(3-benzyloxy)-prop-1-ynyl)-3-(2-chlorobenzyl)quinazolin- 4(3H)-one. R^(t) 4.25 min;m/z 654/656 (M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 4.41 (2H, s),4.60 (2H, s), 5.31 (2H, s), 5.76 (2H, s), 6.17 (1H, d), 6.76 (1H, t),6.87 (2H, d), 6.99- 7.05 (1H, m), 7.13 (1H, d), 7.25 (5H, s), 7.32 (2H,d), 7.67 (1H, d), 7.75 (1H, d), 7.81-7.87 (1H, m), 8.16 (1H, s), 9.77(1H, s). 41

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chloro-benzyl)-5-(5-hydroxypent-1-ynyl)quinazolin- 4(3H)-one. R^(t) 3.37 min;m/z 592/594 (M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 1.65 (2H,quin), 2.44 (2H, t), 3.48 (2H, q), 4.48 (1H, t), 5.28 (2H, s), 5.72 (2H,s), 6.14 (1H, d), 6.77 (1H, t), 6.87 (2H, d), 7.02 (1H, t), 7.11 (1H,d), 7.32 (2H, d), 7.59 (1H, d), 7.64-7.69 (1H, m), 7.79 (1H, t), 8.16(1H, s), 9.77 (1H, s). 42

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(2-fluoro-5-methoxybenzyl)quinazolin-4(3H)-one. R^(t) 3.47 min; m/z 548(M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d6) δ: 3.38 (3H, s), 4.44 (1H, s),5.31 (2H, s), 5.76 (2H, s), 5.78 (1H, dd), 6.59-6.64 (1H, m), 6.83 (1H,t), 6.87 (2H, d), 7.31 (2H, m), 7.65-7.71 (2H, m), 7.77-7.84 (1H, m),8.17 (1H, s), 9.77 (1H, s). 43

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(3,4-dichloro-benzyl)-5-ethynylquinazolin-4(3H)-one. R^(t) 3.73 min; m/z 568/570 (M +H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 4.45 (1H, s), 5.30 (2H, s), 5.72(2H, s), 6.61 (1H, dd), 6.87 (2H, d), 6.90-6.95 (1H, m), 7.19 (1H, d),7.30 (2H, d), 7.65-7.72 (2H, m), 7.77-7.84 (1H, m), 8.23 (1H, s), 9.78(1H, br s). 44

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-benzyl-5- ethynylquinazolin-4(3H)-one.R^(t) 3.39 min; m/z 500 (M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ:4.45 (1H, s), 5.38 (2H, s), 5.70 (2H, s), 6.83 (2H, d), 6.88 (2H, d),7.06-7.14 (3H, m), 7.34 (2H, d), 7.55 (1H, d), 7.64-7.68 (1H, m),7.73-7.79 (1H, m), 8.19 (1H, s), 9.77 (1H, s). 45

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(2-trifluoromethylbenzyl)quinazolin-4(3H)-one. R^(t) 3.74 min; m/z 568 (M +H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 4.42 (1H, s), 5.47 (2H, s), 5.74(2H, s), 6.37 (1H, d), 6.88 (2H, d), 7.11 (1H, t), 7.25 (1H, t), 7.34(2H, d), 7.50 (1H, d), 7.69 (1H, d), 7.71-7.75 (1H, m), 7.83 (1H, t),8.09 (1H, s), 9.80 (1H, br s). 46

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl-5-ethynyl-3-(4-methoxybenzyl)quinazolin-4(3H)-one. R^(t) 3.39 min; m/z 530 (M + H)⁺(ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 3.65 (3H, s), 4.46 (1H, s), 5.31(2H, s), 5.71 (2H, s), 6.68 (2H, d), 6.81 (2H, d), 6.88 (2H, d), 7.35(2H, d), 7.48-7.55 (1H, m), 7.63-7.68 (1H, m), 7.71-7.78 (1H, m), 8.21(1H, s), 9.78 (1H, s). 47

4-((2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-4-oxoquinazolin-3(4H)-yl)methyl)- benzonitrile. R^(t) 3.37 min;m/z 525 (M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 4.44 (1H, s), 5.38(2H, s), 5.71 (2H, s), 6.79 (2H, d), 6.87 (2H, d), 7.30 (2H, d), 7.37(2H, d), 7.64-7.75 (2H, m), 7.78-7.88 (1H, m), 8.21 (1H, s), 9.80 (1H,br s). 48

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(2-fluoro-4-methoxybenzyl)quinazolin-4(3H)-one. R^(t) 3.50 min; m/z 548(M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 3.62 (3H, s) 4.44 (1H, s)5.25 (2H, s) 5.75 (2H, s) 6.27-6.35 (2H, m) 6.49-6.56 (1H, m) 6.88 (2H,d) 7.33 (2H, d) 7.60-7.70 (2H, m) 7.75-7.83 (1H, m) 8.19 (1H, s) 9.80(1H, br s). 49

1-(3-(2-((4-amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5- yl)prop-2-ynyl)urea. R^(t)3.02 min; m/z 606/608 (M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO- d₆) δ: 4.02(2H, d), 5.28 (2H, s), 5.58 (2H, s), 5.74 (2H, br s), 6.13 (1H, d),6.27-6.33 (1H, m), 6.72-6.79 (1H, m), 6.87 (2H, d), 6.99-7.05 (1H, m),7.08-7.13 (1H, m), 7.31 (2H, d), 7.59- 7.64 (1H, m), 7.72 (1H, d), 7.82(1H, t), 8.16 (1H, br s), 9.77 (1H, s). 50

2-((4-amino-3-(3-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(2-fluoro-benzyl)-5-(3-(2-(2-methoxyethoxy)ethoxy)-prop-1-ynyl)quinazolin-4(3H)-one. R^(t) 3.58 min; m/z 650 (M + H)⁺(ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 3.19 (3H, s), 3.37-3.39 (2H, m),3.46 (2H, dd), 3.51 (2H, dd), 3.63 (2H, dd), 4.39 (2H, s), 5.35 (2H, s),5.78 (2H, s), 6.29- 6.36 (1H, m), 6.69-6.75 (1H, m), 6.82-6.86 (1H, m),6.86-6.95 (3H, m), 7.05-7.12 (1H, m), 7.30 (1H, t), 7.64-7.69 (2H, m),7.78-7.83 (1H, m), 8.20 (1H, s), 9.68 (1H, s). 51

2-((4-Amino-3-(4-fluoro-3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-ethynylquinazolin-4(3H)-one. R^(t) 3.79 min; m/z 552/554(M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 4.46 (1H, s), 5.35 (2H, s),5.38 (2H, s), 6.89 (1H, d), 7.13- 7.35 (4H, m), 7.45-7.53 (2H, m),7.67-7.73 (2H, d), 7.78-7.85 (1H, m,) 8.21 (1H, s), 13.59 (1H, s). 52

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chloro-benzyl)-5-(3-phenoxyprop-1-ynyl)quinazolin- 4(3H)-one. R^(t) 4.25 min;m/z 640/642 (M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 5.00 (2H, s),5.30 (2H, s), 5.75 (2H, s), 6.15 (1H, d), 6.76 (1H, t), 6.87 (2H, d),6.92 (1H, t), 7.00- 7.06 (3H, m), 7.12 (1H, d), 7.21-7.27 (2H, m), 7.32(2H, d), 7.62 (1H, d), 7.71-7.78 (1H, m), 7.83 (1H, t), 8.15 (1H, s),9.78 (1H, br s). 53

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(2-fluoro-benzyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)- quinazolin-4(3H)-one R^(t)3.60 min; m/z 673 (M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO- d₆) δ:1.68-1.76 (2H, m), 2.45-2.48 (2H, m), 2.53-2.58 (2H, m), 3.27 (2H, d),3.30-3.33 (4H, m), 3.41-3.49 (2H, m), 5.34 (2H, s), 5.74 (2H, s), 6.30(1H, t), 6.70 (1H, t), 6.82-6.91 (3H, m), 7.07 (1H, q), 7.32 (2H, d),7.62 (1H, d), 7.59 (1H, d), 7.74-7.81 (1H, m), 8.18 (1H, s), 9.76 (1H,s). 54

6-(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(2-methoxyethyl)hex-5-ynamide. R^(t) 3.59 min; m/z 677/679 (M +H)⁺ (ES⁺); 1H NMR (500 MHz, DMSO-d₆) δ: 1.71 (2H, quin), 2.21 (2H, t),2.39 (2H, t), 3.13 (2H, q), 3.18 (3H, s), 3.23-3.27 (2H, m), 5.29 (2H,s), 5.75 (2H, s), 6.14 (1H, d), 6.78 (1H, t), 6.81-6.86 (1H, m),6.89-6.94 (2H, m), 7.03 (1H, t), 7.12 (1H, d), 7.26-7.33 (1H, m), 7.62(1H, d), 7.68 (1H, d), 7.76-7.86 (2H, m), 8.18 (1H, br s), 9.69 (1H, s).55

2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(7-morpholino-7-oxohept-1- yn-1-yl)quinazolin-4(3H)-one.R^(t) 3.75 min; m/z 703/705 (M + H)⁺ (ES⁺); 1H NMR (500 MHz, DMSO-d₆) δ:1.49-1.56 (2H, m), 1.56-1.65 (2H, m), 2.29 (2H, t), 2.42 (2H, t),3.37-3.43 (4H, m), 3.45-3.53 (4H, m), 5.28 (2H, s), 5.75 (2H, br s),6.13 (1H, d), 6.78 (1H, t), 6.81-6.87 (1H, m), 6.89-6.95 (2H, m), 7.03(1H, t), 7.12 (1H, d), 7.30 (1H, t), 7.58 (1H, d), 7.67 (1H, d), 7.79(1H, t), 8.21 (1H, br s), 9.68 (1H, s). 56

2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chloro-benzyl)-5-(5-morpholino-5-oxopent-1-yn-1- yl)quinazolin-4(3H)-one. R^(t)3.54 min; m/z 675/677 (M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ:2.56-2.67 (4H, m), 3.37-3.41 (4H, m), 3.43-3.50 (4H, m), 5.28 (2H, s),5.75 (2H, S), 6.12 (1H, d), 6.77 (1H, t), 6.81-6.86 (1H, m), 6.89-6.95(2H, m), 7.03 (1H, t), 7.12 (1H, d), 7.30 (1H, t), 7.57 (1H, d), 7.68(1H, d), 7.80 (1H, t), 8.18 (1H, br s), 9.68 (1H, s). 57

2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-((5-methyl-pyrazin-2-yl)methyl)-5-(6-morpholino-6-oxo-hex-1-yn-1-yl)quinazolin-4(3H)-one. R^(t) 3.31 min; m/z 671 (M + H)⁺(ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 1.72 (2H, quin), 2.35 (3H, s),2.45-2.48 (2H, m), 2.54 (2H, br s), 3.25-3.29 (2H, m), 3.31-3.36 (4H,m), 3.43-3.49 (2H, m), 5.46 (2H, s), 5.81 (2H, s), 6.86 (1H, dd), 6.91-6.98 (2H, m), 7.32 (1H, t), 7.53-7.57 (2H, m), 7.69-7.77 (1H, m), 8.08(1H, s), 8.11 (1H, s), 8.23 (1H, br s), 9.71 (1H, s). 58

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chloro-benzyl)-5-(6-oxo-6-(piperidin-1-yl)hex-1-yn-1- yl)quinazolin-4(3H)-one.R^(t) 4.08 min; m/z 687/689 (M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ:1.14-1.23 (2H, m), 1.25-1.34 (2H, m), 1.37-1.46 (2H, m), 1.67 (2H,quin), 2.43- 2.47 (2H, m), 2.52-2.55 (2H, m), 3.07-3.15 (2H, m),3.24-3.30 (2H, m), 5.27 (2H, s), 5.72 (2H, s), 6.14 (1H, d), 6.76 (1H,t), 6.86 (2H, d), 7.01 (1H, t), 7.09 (1H, d), 7.31 (2H, d), 7.59 (1H,d), 7.68 (1H, d), 7.79 (1H, t), 8.16 (1H, s), 9.76 (1H, s). 59

6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N,N-diethylhex-5-ynamide. R^(t) 4.01 min; m/z 675/677 (M + H)⁺(ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 0.85 (3H, t), 0.89 (3H, t), 1.69(2H, quin), 2.44-2.48 (2H, m), 2.52-2.53 (2H, m), 3.04 (2H, q), 3.14(2H, q), 5.27 (2H, s), 5.73 (2H, s), 6.14 (1H, d), 6.75 (1H, t), 6.87(2H, d), 7.01 (1H, t), 7.09 (1H, d), 7.31 (2H, d), 7.60 (1H, d), 7.68(1H, d), 7.80 (1H, t), 8.15 (1H, s), 9.77 (1H, br s). 60

7-(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin- 5-yl)hept-6-ynoic acid. R^(t)3.80 min; m/z 634/636 (M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ:1.47-1.56 (2H, m), 1.60 (2H, quin), 2.20 (2H, t), 2.41 (2H, t), 5.28(2H, s), 5.75 (2H, s), 6.13 (1H, d), 6.78 (1H, t), 6.83 (1H, dd),6.90-6.94 (2H, m), 7.03 (1H, t), 7.12 (1H, d), 7.30 (1H, t), 7.59 (1H,d), 7.64-7.69 (1H, m), 7.76-7.82 (1H, m), 8.17 (1H, s). 61

2-Acetamido-N-(3-(2-((4-amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)prop-2-yn-1-yl)- acetamide. R^(t) 3.25 min; m/z663/665 (M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 1.82 (3H, s), 3.65(2H, d), 4.11 (2H, d), 5.29 (2H, s), 5.76 (2H, s), 6.12 (1H, d), 6.77(1H, t), 6.81-6.86 (1H, m), 6.89-6.94 (2H, m), 7.03 (1H, t), 7.12 (1H,d), 7.26-7.32 (1H, m), 7.62 (1H, d), 7.72 (1H, d), 7.83 (1H, t), 8.11(1H, t), 8.17 (1H, s), 8.37 (1H,t), 9.69 (1H, br s). 62

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(3-methoxy-5-(trifluoromethyl)benzyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin- 4(3H)-one. R^(t) 3.74 min; m/z753/755 (M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 1.73 (2H, quin),2.47-2.49 (2H, m), 2.53-2.56 (2H, m), 3.22-3.28 (2H, m), 3.28-3.31 (2H,m), 3.33-3.34 (2H, m), 3.41-3.46 (2H, m), 3.58 (3H, s), 5.39 (2H, br s),5.71 (2H, br s), 6.36 (1H, s), 6.68 (1H, s), 6.86 (2H, d), 6.91 (1H, s),7.27 (2H, d), 7.59 (2H, d), 7.72-7.82 (1H, m), 8.21 (1H, br s), 9.77(1H, s). 63

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(benzo[b]thiophen-2-ylmethyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin- 4(3H)-one. R^(t) 3.68 min; m/z711 (M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 1.78 (2H, quin),2.54-2.56 (2H, m), 2.60-2.63 (2H, m), 3.43-3.59 (8H, m), 5.62 (2H, s),5.83 (2H, s), 6.82 (2H, d), 7.05 (1H, s), 7.20 (2H, d), 7.27-7.32 (2H,m), 7.41 (1H, d), 7.57 (1H, d), 7.61-7.66 (1H, m), 7.67-7.73 (1H, m),7.80-7.86 (1H, m), 8.24 (1H, br s), 9.76 (1H, s). 64

2-((4-Ammo-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-fluoro-3-methoxybenzyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one. R^(t) 3.47 min; m/z 703 (M + H)⁺(ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 1.71 (2H, quin), 2.44-2.49 (2H, m),2.54 (2H, t), 3.20-3.35 (6H, m), 3.42-3.46 (2H, m), 3.73 (3H, s), 5.33(2H, br s), 5.69-5.76 (2H, m), 5.80 (1H, t), 6.61 (1H, t), 6.82 (1H, t),6.87 (2H, d), 7.33 (2H, d), 7.61 (1H, d), 7.58 (1H, d), 7.71-7.81 (1H,m), 8.26 (1H, br s), 9.78 (1H, s). 65

Methyl 3-((2-((4-amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)-4-oxoquinazolin-3(4H)-yl)methyl)benzoate. R^(t) 4.44 min; m/z 713 (M + H)⁺(ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 1.73 (2H, quin), 2.44-2.59 (4H, m),3.25 (4H, s), 3.30-3.34 (2H, m), 3.40-3.43 (2H, m), 3.69 (3H, s), 5.39(2H, br s), 5.73 (2H, brs), 6.79-6.86 (3H, m), 6.90 (1H, d), 7.11 (1H,t), 7.19 (1H, s), 7.26 (1H, t), 7.57-7.66 (3H, m), 7.75-7.82 (1H, m),8.22 (1H, br s), 9.67 (1H, s). 66

2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-((1-methyl-1H-pyrazol-4-yl)methyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one. R^(t) 4.47 min; m/z 659 (M + H)⁺(ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 1.80 (2H, quin), 2.54- 2.57 (2H, m),2.65-2.68 (2H, m), 3.38-3.43 (4H, m), 3.47-3.55 (4H, m), 3.71 (3H, s),5.18 (2H, s), 5.81 (2H, s), 6.86 (1H, dd), 7.00-7.07 (2H, m), 7.24 (1H,s), 7.29-7.36 (2H, m), 7.49-7.54 (2H, m), 7.61-7.67 (1H, m), 8.26 (1H,s), 9.70 (1H, s). 67

2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(benzofuran-5-ylmethyl)-5-(6-morpholino-6-oxohex-1-yn-1- yl)quinazolin-4(3H)-one.R^(t) 4.46 min; m/z 695 (M + H)⁺ (ES⁺); ¹H NMR (500 MHz DMSO- d₆) δ:1.75 (2H, quin), 2.51-2.55 (2H, m), 2.58 (2H, t), 3.29 (4H, dd),3.40-3.58 (4H, m), 5.49 (2H, br s), 5.73 (2H, s), 6.74-6.78 (1H, m),6.80-6.87 (2H, m), 6.87-6.95 (2H, m), 7.11 (1H, s), 7.27 (1H, t), 7.37(1H, d), 7.44 (1H, d), 7.57 (1H, d), 7.68-7.74 (1H, m), 7.89 (1H, d),8.21 (1H, s), 9.68 (1H, br s). 68

2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-((2-methyl-thiazol-4-yl)methyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one. R^(t) 4.42 min; m/z 676 (M + H)⁺ (ES⁺);¹H NMR (500 MHz, DMSO-d₆) δ: 1.75 (2H, quin), 2.46 (3H, s), 2.57-2.62(4H, m), 3.37-3.60 (8H, m), 5.36 (2H, s), 5.87 (2H, s), 6.80 (1H, s),6.82-6.87 (1H, m), 6.98-7.04 (2H, m), 7.28-7.34 (1H, m), 7.48 (1H, d),7.53-7.57 (1H, m), 7.68-7.73 (1H, m), 8.26 (1H, br s), 9.69 (1H, s). 69

2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chloro-benzyl)-5-(6-(4-methylpiperazin-1-yl)-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one. R^(t) 4.38 min; m/z 702/704 (M +H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 1.71 (2H, quin), 1.91-2.34 (7H,m), 2.44-2.48 (2H, m), 2.48-2.49 (2H, m), 3.22-3.30 (2H, m), 3.32- 3.34(2H, m), 5.30 (2H, s), 5.75 (2H, s), 6.17 (1H, d), 6.80 (1H, t), 6.84(1H, dd), 6.90-6.95 (2H, m), 7.05 (1H, t), 7.12 (1H, d), 7.30 (1H, t),7.61 (1H, d), 7.68 (1H, d), 7.80 (1H, t), 8.18 (1H, s), 9.68 (1H, s). 70

2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chloro-benzyl)-5-(6-(4-morpholinopiperidin-1-yl)-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one. R^(t) 4.43 min; m/z 772/774(M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 1.13 (2H, brs), 1.52 (1H,br s), 1.63-1.76 (3H, m), 2.04- 2.80 (11H, m), 3.56 (4H, br s), 3.79(1H, d), 4.33 (1H, d), 5.29 (2H, s), 5.76 (2H, br s), 6.16 (1H, d), 6.79(1H, t), 6.82-6.87 (1H, m), 6.89- 6.94 (2H, m), 7.05 (1H, t), 7.13 (1H,d), 7.30 (1H, t), 7.60 (1H, d), 7.69 (1H, d), 7.80 (1H, t), 8.21 (1H, brs), 9.69 (1H, s). 71

5-(6-(4-Acetylpiperazin-1-yl)-6-oxohex-1-yn-1-yl)-2-((4-amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)quinazolin-4(3H)-one. R^(t) 4.32 min; m/z 730/732 (M + H)⁺(ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 1.72 (2H, t), 1.99 (3H, d),2.53-2.54 (2H, m), 2.55-2.59 (2H, m), 3.16-3.33 (8H, m), 5.28 (2H, d),5.73 (2H, br s), 6.09-6.21 (1H, m), 6.77 (1H, dt), 6.87 (2H, d),6.96-7.05 (1H, m), 7.06-7.12 (1H, m), 7.32 (2H, d), 7.61 (1H, d), 7.69(1H, d), 7.77-7.85 (1H, m), 8.18 (1H, br s), 9.78 (1H, s). 72

N-(4-(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)but-3-yn-1-yl)morpholine-4-carboxamide. R^(t) 4.92 min; m/z 690/692(M + H)⁺ (ES⁺); ¹H NMR (500 MHz, DMSO-d₆) δ: 2.52-2.56 (2H, m),3.09-3.19 (4H, m), 3.21-3.28 (2H, m), 3.40-3.45 (4H, m), 5.30 (2H, s),5.76 (2H, br s), 6.16 (1H, d), 6.60 (1H, t), 6.79 (1H, t), 6.84 (1H,dd), 6.90-6.95 (2H, m), 7.05 (1H, t), 7.13 (1H, d), 7.30 (1H, t), 7.63(1H, d), 7.69 (1H, d), 7.82 (1H, t), 8.18 (1H, s), 9.69 (1H, s). 73

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-5-(5-(bis(2-methoxyethyl)amino)pent-1-ynyl)-3-(2-chloro-benzyl)quinazolin-4(3H)-one. R^(t) 1.42 min; m/z 707/709 (M + H)⁺ (ES⁺)(Method D); ¹H NMR (400 MHz, DMSO-d₆) δ: 1.59 (2H, quin), 2.42 (2H, t),2.53-2.59 (6H, overlapping m), 3.15 (6H, s), 3.30 (4H, m), 5.29 (2H, s),5.73 (2H, s), 6.17 (1H, d), 6.78 (1H, m), 6.88 (2H, d), 7.03 (1H, m),7.12 (1H, dd), 7.33 (2H, d), 7.56 (1H, dd), 7.66 (1H, dd), 7.79 (1H, m),8.16 (1H, s), 9.78 (1H, s). 74

6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-cyclopentylhex-5-ynamide. R^(t) 1.99 min; m/z 687/689 (M + H)⁺(ES⁺) (Method D); ¹H NMR (400 MHz, DMSO-d₆) δ: 1.25 (2H, m), 1.44 (2H,m), 1.53 (2H, m), 1.69-1.76 (4H, overlapping m), 2.17 (2H, t), 2.39 (2H,t), 3.93 (1H, m), 5.29 (2H, s), 5.74 (2H, s), 6.15 (1H, d), 6.78 (1H,t), 6.88 (2H, d), 7.03 (1H, t), 7.12 (1H, dd), 7.32 (2H, d), 7.62 (1H,dd), 7.67- 7.70 (2H, overlapping m), 7.81 (1H, t), 8.16 (1H, s), 9.78(1H, br s). 75

6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(tetrahydro-2H-pyran-4-yl)hex-5- ynamide. R^(t) 1.76 min; m/z703/705 (M + H)⁺ (ES⁺) (Method D); ¹H NMR (400 MHz, DMSO) δ: 1.22-1.32(2H, overlapping m), 1.58-1.62 (2H, overlapping m), 1.73 (2H, quin),2.19 (2H, t), 2.40 (2H, t), 3.24-3.28 (2H, overlapping m), 3.66-3.77(3H, over- lapping m), 5.29 (2H, s), 5.73 (2H, s), 6.17 (1H, d), 6.78(1H, t), 6.87 (2H, d), 7.02 (1H, t), 7.11 (1H, dd), 7.33 (2H, d), 7.69(1H, dd), 7.67-7.70 (2H, overlapping m), 7.80 (1H, t), 8.15 (1H, s),9.74 (1H, s). 76

6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(2-morpholinoethyl)hex-5-ynamide. R^(t) 1.45 min; m/z 732/734(M + H)⁺ (ES⁺) (Method D); ¹H NMR (400 MHz, DMSO) δ: 1.72 (2H, m),2.18-2.24 (4H, overlapping m), 2.29 (4H, m), 2.42 (2H, t), 3.08 (2H, q),3.49 (4H, t), 5.28 (2H, s), 5.73 (2H, s), 6.15 (1H, d), 6.76 (1H, t),6.87 (2H, d), 7.02 (1H, t), 7.11 (1H, d), 7.32 (2H, d), 7.61 (1H, dd),7.65-7.69 (2H, overlapping m), 7.80 (1H, t), 8.15 (1H, s), 9.77 (1H, s).77

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chloro-benzyl)-5-(6-(4-(2-methoxyethyl)-piperazin-1-yl)-6-oxohex-1-ynyl)quinazolin-4(3H)-one. R^(t) 1.33 min; m/z 746/748(M + H)⁺ (ES⁺) (Method D); ¹H NMR (400 MHz, DMSO) δ: 1.78 (2H, quin),2.31 (4H, m), 2.45-2.50 (6H, m), 3.26 (3H, s), 3.36 (4H, m), 3.43 (2H,t), 5.41 (2H, s), 5.67 (2H, s), 6.27 (2H, br s), 6.48 (1H, d), 6.90-6.97(3H, overlapping m), 7.12 (1H, m), 7.24 (1H, dd), 7.37 (2H, d),7.54-7.57 (2H, overlapping m), 7.73 (1H, t), 8.17 (1H, s), 9.37 (1H, s).78

6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(2-(dimethylamino)ethyl)hex-5- ynamide. R^(t) 1.37 min; m/z690/692 (M + H)⁺ (ES⁺) (Method D); ¹H NMR (400 MHz, DMSO) δ: 1.70 (2H,quin), 2.07 (6H, s), 2.16- 2.21 (4H, overlapping m), 2.39 (2H, t), 3.05(2H, q), 5.28 (2H, s), 5.73 (2H, s), 6.15 (1H, d), 6.77 (1H, t), 6.87(2H, d), 7.01 (1H, t), 7.11 (1H, m), 7.31 (2H, d), 7.60-7.69 (3H,overlapping m), 7.79 (1H, t), 8.15 (1H, s), 9.79 (1H, s). 79

6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(pyridin-4-yl)hex-5-ynamide. R^(t) 1.40 min; m/z 696/698 (M +H)⁺ (ES⁺) (Method D); ¹H NMR (400 MHz, DMSO) δ: 1.83 (2H, m), 2.50-2.53(4H, overlapping m), 5.29 (2H, s), 5.73 (2H, s), 6.17 (1H, d), 6.77 (1H,t), 6.87 (2H, d), 7.00 (1H, t), 7.10 (1H, d), 7.32 (2H, d), 7.51 (2H, brs), 7.60 (1H, dd), 7.67 (1H, dd), 7.77 (1H, t), 8.15 (1H, s), 8.37 (2H,br s), 9.75 (1H, s), 10.22 (1H, s). 80

6-(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(pyridin-4-yl)hex-5-ynamide. R^(t) 1.42 min; m/z 696/698 (M +H)⁺ (ES⁺) (Method D); ¹H NMR (400 MHz, DMSO-d₆) δ: 1.84 (2H, quintet),5.31 (2H, s), 5.76 (2H, s), 6.17 (1H, d), 6.79 (2H, dt), 6.85 (1H ddd),6.92-6.94 (2H, overlapping m), 7.03 (1H, td), 7.12 (1H, dd), 7.31 (1H,t), 7.51 (2H, dd), 7.62 (1H, dd), 7.67 (1H, dd), 7.78 (1H dd), 8.18 (1H,br s), 8.37 (2H dd), 9.66 (1H, br s), 10.22 (1H, br s). 81

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chloro-benzyl)-5-(6-(4-(dimethylamino)piperidin-1-yl)-6-oxohex-1-ynyl)quinazolin-4(3H)-one. R^(t) 1.34 min; m/z 730/732(M + H)⁺ (ES⁺) (Method D); ¹H NMR (400 MHz, DMSO) δ: 1.01-1.09 (2H,overlapping m), 1.14-1.24 (3H, overlapping m), 1.61-1.66 (2H,overlapping m), 1.78 (2H, quin), 2.15 (6H, s), 2.17-2.25 (2H,overlapping m), 2.48-2.55 (4H, overlapping m), 5.41 (2H, s), 5.67 (2H,s), 6.27 (2H, br s), 6.48 (1H, d), 6.90-6.97 (3H, overlapping m), 7.12(1H, m), 7.24 (1H, d), 7.37 (2H, d), 7.54-7.57 (2H, overlapping m), 7.73(1H, t), 8.17 (1H, s), 9.37 (1H, br s). 82

6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N,N-bis(2-methoxyethyl)hex-5-ynamide. R^(t) 1.89 min; m/z 735/737(M + H)⁺ (ES⁺) (Method D); ¹H NMR (400 MHz, DMSO) δ: 1.70 (2H, quin),2.45 (2H, t), 2.55 (2H, t), 3.11 (3H, s), 3.18 (3H, s), 3.24-3.35 (8H,overlapping m), 5.28 (2H, s), 5.73 (2H, s), 6.20 (1H, d), 6.79 (1H, t),6.88 (2H, d), 7.03 (1H, t), 7.13 (1H, d), 7.33 (2H, d), 7.60 (1H, d),7.67 (1H, d), 7.80 (1H, t), 8.19 (1H, s), 9.75 (1H, s). 83

6-(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N,N-bis(2-methoxyethyl)hex-5-ynamide. R^(t) 1.92 min; m/z 735/737(M + H)⁺ (ES⁺) (Method D); ¹H NMR (400 MHz, DMSO-d₆) δ: 1.70 (2H, quin),2.46 (2H, t), 2.55 (2H, t), 3.12 (3H, s), 3.19 (3H, s), 3.26 (2H, over-lapping m), 3.31 (4H, m, partially obscured by HOD peak), 3.35 (2H, q),5.30 (2H, s), 5.76 (2H, s), 6.18 (1H, dd), 6.80 (1H, dt), 6.85 (1H ddd),6.92-6.94 (2H, overlapping m), 7.05 (1H, td), 7.13 (1H, dd), 7.31 (1H,t), 7.61 (1H, dd), 7.68 (1H, dd), 7.81 (1H, dd), 8.18 (1H, br s), 9.65(1H, br s). 84

6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(2-(4-methylpiperazin-1-yl)ethyl)hex-5- ynamide. R^(t) 1.34 min;m/z 745/747 (M + H)⁺ (ES⁺) (Method D); ¹H VT NMR (400 MHz, 100° C.,DMSO-d₆) δ: 1.79 (2H, quin), 2.12 (3H, s), 2.22-2.35 (10H, overlappingm), 2.44- 2.50 (4H, overlapping m), 3.12 (2H, q), 5.42 (2H, s), 5.68(2H, s), 6.28 (2H, s), 6.49 (1H, d), 6.90-6.97 (3H, overlapping m), 7.13(1H, m), 7.18 (1H, br s), 7.24 (1H, d), 7.37 (2H, d), 7.55-7.58 (2H,overlapping m), 7.74 (1H, t), 8.17 (1H, s), 9.37 (1H, br s). 85

6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-methyl-N-(2-(4-methylpiperazin-1- yl)ethyl)hex-5-ynamide. R^(t)1.40 min; m/z 759/761 (M + H)⁺ (ES⁺) (Method D); ¹H VT NMR (400 MHz,100° C., DMSO-d₆) δ: 1.79 (2H, quin), 2.12 (3H, s), 2.25 (4H, bs), 2.33-2.36 (6H, overlapping m), 2.79 (3H, s), 3.29 (2H, t), 5.41 (2H, s), 5.68(2H, s), 6.27 (2H, s), 6.46 (1H, d), 6.89-6.96 (3H, overlapping m), 7.02(1H, m), 7.11 (1H, t), 7.24 (1H, dd), 7.37 (2H, d), 7.56 (2H, d), 7.73(1H, t), 8.17 (1H, s). 86

6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-isopropylhex-5-ynamide. R^(t) 1.87 min; m/z 661/663 (M + H)⁺(ES⁺) (Method D); ¹H NMR (400 MHz, DMSO) δ: 0.94-0.95 (6H, d), 1.72 (2H,m), 2.16 (2H, t), 2.39 (2H, t), 3.78 (1H, m), 5.29 (2H, s), 5.73 (2H,s), 6.17 (1H, d), 6.78 (1H, t), 6.87 (2H, d), 7.02 (1H, t), 7.11 (1H,d), 7.32 (2H, d), 7.55 (1H, d) 7.61 (1H, dd), 7.67 (1H, dd), 7.80 (1H,t), 8.15 (1H, s), 87

6-(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-isopropylhex-5-ynamide. R^(t) 1.91 min; m/z 661/663 (M + H)⁺(ES⁺) (Method D); ¹H NMR (400 MHz, DMSO-d₆) δ: 0.96 (6H, d), 1.72 (2H,quin), 2.17 (2H, t), 2.40 (2H, t), 3.79 (1H, septuplet), 5.31 (2H, s),5.76 (2H, s), 6.17 (1H, d), 6.80 (1H, dt), 6.83 (1H ddd), 6.92-6.94 (2H,m), 7.04 (1H, td), 7.14 (1H, dd), 7.31 (1H, t), 7.55 (1H, d), 7.63 (1H,dd), 7.69 (1H, dd), 7.81 (1H dd), 8.18 (1H, br s), 9.66 (1H, br s). 88

6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N,N-dimethylhex-5-ynamide. R^(t) 1.80 min; m/z 647/649 (M + H)⁺(ES⁺) (Method D); ¹H NMR (400 MHz, DMSO) δ: 1.75 (2H, quin), 2.47-2.50(4H, overlapping m), 2.75 (6H, br s), 5.36 (2H, s), 5.71 (2H, s), 6.33-6.37 (3H, overlapping m), 6.86-6.92 (3H, overlapping m), 7.08 (1H, t),7.20 (1H, d), 7.36 (2H, d), 7.57-7.62 (2H, overlapping m), 7.77 (1H, t),8.17 (1H, s), 9.53 (1H, s). 89

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chloro-benzyl)-5-(6-oxo-6-(pyrrolidin-1-yl)hex-1- yn-1-yl)quinazolin-4(3H)-one.R^(t) 1.86 min; m/z 673/675 (M + H)⁺ (ES⁺) (Method D); ¹H NMR (400 MHz,DMSO) δ: 1.70-1.79 (6H, overlapping m), 2.43-2.50 (4H, m, partiallyobscured by DMSO peak), 3.23-3.4 (4H, m, partially obscured by HODpeak), 5.37 (2H, s), 5.71 (2H, s), 6.38 (1H, m), 6.55 (2H, br s),6.90-6.92 (3H, overlapping m), 7.09 (1H, t), 7.21 (1H, d), 7.36 (2H, d),7.59 (2H, t), 7.76 (1H, t), 8.20 (1H, s). 90

6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(pyrrolidin-3-yl)hex-5-ynamide. R^(t) 1.28 min; m/z 688/690 (M +H)⁺ (ES⁺) (Method D); ¹H NMR (400 MHz, DMSO) δ: 1.41 (1H, m), 1.72 (2H,quin), 1.83 (1H, m), 1.94 (1H, m), 2.16-2.20 (2H, overlapping m),2.38-2.50 (4H, overlapping m), 2.69-2.88 (2H, overlapping m), 4.02 (1H,m), 5.29 (2H, s), 5.73 (2H, s), 6.17 (1H, d), 6.78 (1H, m), 6.87 (2H,d), 7.02 (1H, m), 7.12 (1H, m), 7.32 (2H, d), 7.61 (1H, d), 7.67 (1H,dd), 7.76-7.81 (2H, overlapping m), 8.15 (1H, s). 91

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chloro-benzyl)-5-(6-(3-(dimethylamino)pyrrolidin-1-yl)-6-oxohex-1-ynyl)quinazolin-4(3H)-one. R^(t) 1.41 min; m/z 716/718(M + H)⁺ (ES⁺) (Method D); ¹H NMR (400 MHz, DMSO) δ: 1.72 (2H, quin),2.11 (6H, d), 2.37-2.47 (4H, overlapping m), 2.86-2.96 (2H, overlappingm), 3.11-3.17 (2H, overlapping m), 3.41-3.58 (3H, overlapping m), 5.30(2H, s), 5.71 (2H, s), 6.24 (1H, m), 6.82 (1H, m), 6.88 (2H, d), 7.04(1H, m), 7.14 (1H, m), 7.33 (2H, d), 7.52 (2H, over- lapping m), 7.78(1H, m), 8.16 (1H, s), 9.69 (1H, s). 92

2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chloro-benzyl)-5-(6-(3-(dimethylamino)pyrrolidin-1-yl)-6-oxohex-1-ynyl)quinazolin-4(3H)-one. R^(t) 1.34 min; m/z 716/718(M + H)⁺ (ES⁺) (Method D); ¹H NMR (400 MHz, DMSO-d6) δ: 1.55 (2H, br m),1.72 (2H, m), 1.82 (1H, br m), 1.93 (1H, br m), 2.13 (6H, br s), 2.19(1H, br s), 2.93 (2H, q), 3.15 (2H, m), 3.43 (1H, m), 3.55 (1H, m), 5.31(2H, d), 5.75 (2H, s), 6.19 (1H, dd), 6.81 (1H, br t), 6.85 (1H, m),6.92- 6.95 (2H, overlapping m), 7.05 (1H, td), 7.13 (1H, dd), 7.31 (1H,t), 7.62 (1H, m), 7.67 (1H, m), 7.80 (1H, dt), 8.18 (1H, s), 9.66 (1H,br s). 93

2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chloro-benzyl)-5-(6-(4-methyl-1,4-diazepan-1-yl)-6-oxohex-1-ynyl)quinazolin-4(3H)-one. R^(t) 1.35 min; m/z 716/718 (M + H)⁺(ES⁺) (Method D); ¹H NMR (400 MHz, DMSO) δ: 1.66 (2H, br s), 1.80 (2H,quin), 2.21 (3H, s), 2.42-2.53 (8H, overlapping m), 3.41 (4H, br s),5.41 (2H, s), 5.67 (2H, s), 6.26 (2H, br s), 6.47 (1H, d), 6.90-6.97(3H, overlapping m), 7.11 (1H, m), 7.24 (1H, dd), 7.37 (2H, d),7.55-7.57 (2H, overlapping m), 7.73 (1H, t), 8.17 (1H, s), 9.37 (1H, brs). 94

2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo-[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chloro-benzyl)-5-(6-(4-methyl-1,4-diazepan-1-yl)-6-oxohex-1-ynyl)quinazolin-4(3H)-one. R^(t) 1.36 1.36 min; m/z 716/718(M + H)⁺ (ES⁺) (Method D); ¹H NMR (400 MHz, DMSO-d₆) δ: 1.57 (1H, m),1.61-1.75 (3H, overlapping m), 2.15 (3H, d), 2.27-2.45 (5H, overlappingm), 3.26 (2H, m), 3.37 (2H, m), 5.29 (2H, s), 5.75 (2H, s), 6.15 (1H,d), 6.79 (1H, dt), 6.83 (1H ddd), 6.92-6.93 (2H, overlapping m), 7.04(1H, td), 7.12 (1H, dd), 7.30 (1H, t), 7.62 (1H, dd), 7.68 (1H, dd),7.81 (1H dd), 8.18 (1H, br s), 9.69 (1H, br s). 95

2-((4-Amino-3-(4-hydroxy-3-methoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-morpholino-6-oxohex- 1-ynyl)quinazolin-4(3H)-one.R^(t) 1.78 min; m/z 719/721 (M + H)⁺ (ES⁺) (Method D); ¹H NMR (400 MHz,DMSO-d₆) δ: 1.71 (2H, quin), 2.46- 2.55 (4H, overlapping m, partiallyobscured by DMSO signal), 3.23 (2H, m), 3.33 (4H, m, partially obscuredby HOD signal), 3.45 (2H, m), 3.82 (3H, s), 5.30 (2H, s), 5.74 (2H, s),6.18 (1H, dd), 6.81 (1H, td), 6.86-6.92 (2H, overlapping m), 6.97 (1H,d), 7.05 (1H, td), 7.14 (1H, dd), 7.61 (1H, dd), 7.68 (1H, dd), 7.81(1H, dd), 8.17 (1H, br s), 9.35 (1H, br s)..

Stereochemical Analysis of Compound Examples by Chiral, Stationary PhaseHPLC

A common structural feature shared by many quinazolinone-based compoundsthat have been reported previously as potent PI3K inhibitors, is thepresence of an aromatic nucleus bonded directly to N-3 of the bicyclicsystem (see for example WO 2001/081346 and WO 2008/127226). Dependingupon the exact nature of the aryl substituent, this motif can give riseto sterically compressed bi-aryls, in which the rotational degree offreedom around the N-3 to C-aryl single bond is dramatically reduced.Compelling evidence has been obtained that in the case of compoundsincorporating an ortho-substituted benzene ring, bond rotation can be sohindered as to give rise to discrete conformers. For example, chiralstationary phase HPLC analysis of PIK294 (Example ‘S3’ from WO2008/127226) indicates that the compound exists as readily separable,non-superimposable stereoisomers, that is as a 1:1 mixture ofenantiomeric atropisomers (FIG. 1).

This assuagement was confirmed by the separation of a sample of PIK294,using chiral stationary phase preparative HPLC, into its discreteatropisomers (FIG. 2). As expected these enantiomeric compoundsexhibited identical proton NMR spectra (data not shown) and, at bothambient and elevated temperatures, showed no detectable signs ofinterconversion over several days, indicating that the discreterotational isomers have indefinitely long half lives under physiologicalconditions. The presence of stable atropisomers was also demonstratedfor two additional N-3 aryl quinazolinones: the mercaptopurinederivative 20 (Example D-026 from WO 2001/081346) and a secondpyrazolopyrimidine, analogue 21, revealing that this is a genericstructural feature of this chemotype (FIG. 3).

In contrast, over twenty compounds, selected from the exemplifiedstructures disclosed above (Examples 1, 9, 10, 11, 12, 13, 14, 15, 16,17, 18, 19, 20, 21, 22, 23, 24, 25, 31, 32, 33, 34, and 38) werescreened using chiral stationary phase HPLC (16 different conditions)and no evidence for atropisomerism was observed. The stereochemicalimplications of atropisomerism have been described recently as ‘alurking menace with the potential to significantly increase the cost ofpharmaceutical research and development if ignored.’ (Claydon, J. etal., Angew. Chem. Int. Ed., 2009, 48, 6398-6401).

The additional complexity and consequences for drug developmentresulting from atropisomerism are analogous to those arising from othersources of molecular isomerism such as the presence of a stereogeniccentre. This property renders molecules such as 20 and 21 (FIG. 3) bothchiral, and unless resolved, a racemic mixture; the components of whichcould possess different pharmacological and toxicological profiles. Thisfeature is likely to significantly increase downstream development costsfor such molecules, and the absence of atropisomerism in the compoundsdisclosed herein is therefore a highly desirable and advantageousproperty.

Enzyme Inhibition Assay

PI3 kinases catalyse the phosphorylation of phosphatidylinositol4,5-biphosphate (PIP2) to phosphatidylinositol 3,4,5-triphosphate (PIP3)in the presence of ATP and Mg²⁺ ions. The PIP3 product can be detectedby displacement of biotin-PIP3 from energy transfer complexes consistingof europium labelled anti-GST monoclonal antibody, a GST-taggedPleckstrin homology (PH) domain, biotinylated PIP3 andstreptavidin-allophycocyanin (APC) by the time-resolved fluorescenceresonance energy transfer (TR-FRET) (HTRF®PI3K enzyme assay, Millipore).Excitation (330 nm) of europium in the complex results in an energytransfer to the APC and a fluorescent emission at 665 nm althougheuropium itself emits at its characteristic 620 nm. The PIP3 productformed by PI3K activity displaces biotin-PIP3 from the complex andresults in a loss of energy transfer (decreasing signal).

The compound to be tested was added, at the desired finalconcentrations, to a mixture of PIP2 substrate and recombinant PI3kinase α, δ or γ enzymes (Millipore), and the mixture incubated for 2 hrat RT. Following this incubation period, ATP (20 μM) was added to theenzyme/compound/PIP2 substrate mixture and the resulting mixture wasincubated for 30 min at RT. A stopping solution containing biotinylatedPIP3 and the detection mix containing the GST tagged GRP1 pleckstrinhomology (PH) domain and fluorophores were then added and the mixturewas incubated at RT for 15-18 hr, prior to detection in a fluorescencemicroplate reader (Varioskan® Flash, ThermoFisher Scientific).

The results were calculated according to the formula: APC signal(emission at 665 nm)/europium signal:(emission at 620 nm)×10⁴. Thepercentage inhibition of each reaction was calculated relative to DMSOtreated control, and the 50% inhibitory concentration (IC₅₀ value) thencalculated from the concentration-response curve (Table 3 and Table 4).

P1310 Cell Based Assay

As a means of assessing PI3K δ activation in response to stimuli, thephosphorylation status of the protein, Akt, a downstream product ofPI3Kδ, signaling was determined.

Human monocytic cells (U937 cells), were differentiated tomacrophage-type cells by incubation with phorbol myristate acetate (PMA;100 ng/mL) for 48 to 72 hr. Cells were then pre-incubated with eitherthe test compound or vehicle for 2 hr and were then stimulated brieflyby exposure to H₂O₂ (10 mM; 5-7 min) and the reaction stopped byreplacing the media with 4% formaldehyde solution. Endogenous peroxideactivity and formaldehyde were inactivated by incubating with quenchingbuffer (0.1% sodium azide, 1% H₂O₂ in PBS with 0.1% Triton X-100) for 20min. The cells were washed with buffer (PBS containing 0.1% TritonX-100) and were incubated with blocking solution (1% BSA in PBS) for 1hr and were then re-washed with buffer and incubated overnight witheither anti-pAkt antibody or anti-pan-Akt antibody (both from CellSignaling Technology). After washing with buffer (PBS containing 0.1%Triton X-100), cells were incubated with an HRP-conjugated secondaryantibody (Dako) and the resultant signal was determined colorimetrically(OD: 450 nm with a reference wavelength of 655 nm) using TMB substrate(substrate reagent pack supplied by R&D Systems, Inc.).

This reaction was stopped by addition of 100 μL of 1N H₂SO₄ solution.Cells were then washed with buffer (PBS containing 0.1% Triton X-100)and 100 μL of 5% crystal violet solution was applied for 30 min. Afterwashing with buffer (PBS containing 0.1% Triton X-100) 100 μL of 1% SDSwas added to each well and the plates were shaken lightly for 1 hr priorto measuring the absorbance at 595 nm (Varioskan® Flash, Thermo-FisherScientific). The measured OD₄₅₀₋₆₅₅ readings were corrected for cellnumber by dividing the OD₄₅₀₋₆₅₅ by the OD₅₉₅ readings. The ratio ofpAkt signal to total Akt signal was used to quantitate the extent ofPI3K δ activation. The percentage inhibition for each well wascalculated relative to a 10 μg/mL standard control (LY294002) set to100% inhibition versus H₂O₂-only controls as 0% inhibition. The IC₅₀values were calculated from the concentration-response curves generatedby the serial dilutions of the test compounds (Table 3 and Table 4).

MTT Assay

PMA-differentiated U937 cells were pre-incubated with compound for 4 hrin 5% FCS or 10% FCS for 24 hr. The supernatant was replaced with 200 μLof new media and 10 μL of MTT stock solution (5 mg/ml) added to eachwell. After 1 hr incubation, the media were removed, 200 μL of DMSOadded to each well and the plates were shaken lightly for 1 hr prior toreading the absorbance at 550 nm. The percentage loss of cell viabilitywas calculated for each well relative to vehicle (0.5% DMSO)-treatment(Table 3).

TABLE 3 In Vitro Screening Data: Kinase Isozyme and Cellular ActivityRanges for Exemplified Compounds Cellular Activity Cell Viability PI3Kinase Inhibition IC₅₀ values (H₂O₂ MTT Assay in Test IC₅₀ values atinduced pAkt ^(b) D-U937 cells ^(c) Cmpd stated Isozyme ^(a) D-U937 at 4at 24 Example δ γ α Cells hr hr 1 ++ + + ++ − − 2 ++ + − ++ − − 3 ++ ++++ ++ − − 4 ++ ++ ++ ++ − − 5 ++ ++ ++ ++ − − 6 ++ + + ++ − − 7 ++ + +++ − − 8 ++ + + ++ − − 9 ++ + + ++ − − 10 ++ + + ++ − − 11 ++ + + ++ − −12 ++ + + ++ + − 13 ++ + + ++ − − 14 ++ + + ++ − − 15 ++ + − ++ − − 16++ + + ++ − − 17 ++ − + ++ − − 18 ++ + + ++ − − 19 ++ + + ++ − − 20++ + + ++ − − 21 ++ + + ++ − − 22 ++ + + ++ − − 23 ++ + + ++ − − 24++ + + ++ − − 25 ++ + + ++ − − 26 ++ + + ++ − − 27 ++ + + ++ − − 28++ + + ++ − − 29 ++ + + ++ − − 30 ++ + + ++ − − 31 ++ + + ++ − − 32++ + + ++ − − 33 ++ + + ++ − − 34 ++ + + ++ − − 35 ++ + + ++ − − 36 ++− + ++ − − 37 ++ − + ++ − − 38 ++ + + ++ − − 39 ++ + ++ ++ − − 40 ++ + +++ − − 41 ++ + + ++ − − 42 ++ + + ++ − − 43 ++ + + ++ − − 44 ++ + − ++ −− 45 ++ + + ++ − − 46 ++ + + ++ − − 47 ++ + + ++ − − 48 ++ + + ++ − − 49++ + + ++ − − 50 ++ + + ++ − − 51 ++ + + ++ − − 52 ++ ++ + ++ − − 53 ++++ ++ ++ − − 54 ++ ++ ++ ++ − − 55 ++ ++ + ++ − − 56 ++ ++ ++ ++ − − 57++ ++ + ++ − − 58 ++ ++ + ++ − − 59 ++ ++ + ++ − − 60 ++ ++ + ++ − − 61++ ++ + ++ − − 62 ++ ++ + ++ − − 63 ++ ++ + ++ − − 64 ++ ++ + ++ − − 65++ ++ + ++ − − 66 ++ ++ + ++ − + 67 ++ ++ + ++ − − 68 ++ ++ + ++ − − 69++ ++ + ++ + − 70 ++ ++ + ++ − − 71 ++ ++ + ++ − − 72 ++ ++ + ++ − − 73++ ++ + ++ − − 74 ++ ND ND ND − − 75 ++ ++ + ++ − − 76 ++ ++ + ++ − − 77++ ++ + ++ − − 78 ++ ++ + ++ − − 79 ++ + + ++ − − 80 ++ ND ND + − − 81++ + + ++ − − 82 ++ ++ + ++ − − 83 ++ ND ND ++ − − 84 ++ ND ND ++ − − 85++ ND ND ++ − − 86 ++ ++ ++ ++ − − 87 ++ ND ND ++ − − 88 ++ ++ + ++ − −89 ++ ++ − ++ − − 90 ++ ++ + ++ − − 91 ++ ++ + ++ − − 92 ++ ND ND + − −93 ++ ++ + ++ − − 94 + ND ND + − − 95 ++ ++ + ++ − − ^(a) ++ IC₅₀ < 50nM, + IC₅₀ < 1000 nM, − > 1000 nM. ^(b) ++ IC₅₀ < 10 nM; + IC₅₀ <1000nM; ^(c) − < 30%; + > 30%. ND: not done

TABLE 4 In Vitro Screening Data: Kinase Isozyme and Cellular ActivityValues for Selected ExemplifiedCompounds PI3 Kinase Inhibition CellularActivity Test IC₅₀ values IC₅₀ values (H₂O₂ Cmpd at stated Isozyme (nM)induced pAkt (nM) Example δ γ α D-U937 Cells 1 7 234 199 1.1 4 12 20 171.8 5 20 16 20 0.58 15 4 289 1966 0.57 37 12 1613 474 0.33 86 36 22 270.41 89 3 47 1486 0.2

LPS-Induced Neutrophilia in the Mouse: Determination of Effect andDuration of Action

Non-fasted mice were dosed by the intra-tracheal route with eithervehicle, or the test substance at the time points (“pre-dose”) indicatedwith respect to the start of LPS treatment. At T=0, mice were placedinto an exposure chamber and exposed to LPS. Eight hr after LPSchallenge, animals were anesthetized, the trachea cannulated and BALFextracted by infusing and withdrawing 1 mL of PBS into the lungs via atracheal catheter. Total and differential white cell counts in the BALFsamples were measured using a Neubaur haemocytometer. Cytospin smears ofthe BALF samples were prepared by centrifugation at 200 rpm for 5 min atRT and stained using a DiffQuik stain system (Dade Behring). Cells werecounted using oil immersion microscopy.

The results for the compound of Example 1 are shown in FIG. 4. The upperpanel reveals the effect on BAL neutrophil numbers following theadministration of Example 1 when the compound was dosed 2 hr before LPSchallenge. The lower panel shows the results of a time course experimenton the inhibition of BAL neutrophilia by Example 1 when the compound isadministered at different time points prior to endotoxin challenge. Datafor neutrophil numbers is reported as total and differential number(test substance relative to vehicle) of cells per mL of BALF,mean±S.E.M. (n=8).

The profiles of two additional compounds: the carboxylic acidderivative, Example 4, and the mopholine amide, Example 5, weredetermined in this model of pulmonary inflammation. Treatment of theanimals with the test compounds 2 hr before challenge with endotoxin,produced a comparable and dose dependent inhibition of the evokedinflammatory response as determined by the measurement of neutrophilinflux into the lung (Table 5).

TABLE 5 The effect of escalating doses of compound Example 4 and Example5 on the inhibition of LPS induced neutophilia in mouse lung %Inhibition Test of neutrophils in BAL at the dose indicated Compound(mg/mL) Example No. (0.05) (0.2) (1.0) 4 3.2 47.2 64.6 5 4.8 37.7 58.5

However, by increasing the period between drug treatment and thesubsequent LPS challenge from 2 to 8 hr it was possible to distinguish adifference in the duration of action of the two compounds whenadministered at the same dose. Under these test conditions the level ofanti-inflammatory activity of compound Example 5 was still over half ofits original value, as determined 2 hr after drug treatment, at the 8 hrtime point. (Table 6). In contrast, under the same conditions, theremaining anti-inflammatory effect of compound Example 4 was reduced by90%, to an insignificant level (<5% inhibition), demonstrating that itspharmacological activity is much less sustained.

TABLE 6 Comparison the activities of compounds Example 4 and Example 5to inhibit an evoked (LPS) inflammatory response in mouse lung 2 and 8hr after administration % Reduction Test % Inhibition at 0.2 mg/mL doseof inhibition at Compound at time indicated (hr) 8 hr compared ExampleNo. (2) (8) with 2 hr 4 47.2 12.9 73 5 37.7 21.2 44

Cigarette Smoke Model

A/J mice (males, 5 weeks old) were exposed to cigarette smoke (4%cigarette smoke, diluted with compressed air) for 30 min/day for 11 daysusing a Tobacco Smoke Inhalation Experiment System for small animals(Model SIS-CS; Sibata Scientific Technology, Tokyo, Japan). Testsubstances were given intra-nasally (35 μL of solution in 50% DMSO/PBS)and therapeutically twice daily for 3 days after the final cigarettesmoke exposure. Twelve hr after the last dosing, animals wereanesthetized, the trachea cannulated and bronchoalveolar lavage fluid(BALF) was collected. The numbers of alveolar macrophages andneutrophils were determined by FACS analysis (EPICS® ALTRA II, BeckmanCoulter, Inc., Fullerton, Calif., USA) using anti-mouse MOMA2 antibody(macrophage) or anti-mouse 7/4 antibody (neutrophil).

The results for the compound of Example 1 are shown in FIG. 5 forneutrophils (upper panel) and for activated alveolar macrophages (lowerpanel). The cigarette smoke model used for this study is reported to bea corticosteroid refractory system, [To, Y. et al., Am. J. Respir. Crit.Care Med., 2010, 182:897-904; Medicherla, S. et al., J. Pharmacol. Exp.Ther. 2008, 324:921-9] and the data reveal that dexamethasone (0.3-10mg/kg, p.o.) was inactive. The results obtained for Example 1demonstrate that the compound possesses anti-inflammatory activity whenadministered as a monotherapy. Moreover, when Example 1 wasco-administered with fluticasone propionate, at a dose which lackseffect as monotherapy, a marked enhancement of anti-inflammatoryactivity was detected. Data for cell numbers are shown as the mean±SEM.

Throughout the specification and the claims which follow, unless thecontext requires otherwise, the word ‘comprise’, and variations such as‘comprises’ and ‘comprising’, will be understood to imply the inclusionof a stated integer, step, group of integers or group of steps but notto the exclusion of any other integer, step, group of integers or groupof steps.

All patents and patent applications referred to herein are incorporatedby reference in their entirety.

The application of which this description and claims forms part may beused as a basis for priority in respect of any subsequent application.The claims of such subsequent application may be directed to any featureor combination of features described herein. They may take the form ofproduct, composition, process, or use claims and may include, by way ofexample and without limitation, the claims.

1-22. (canceled)
 23. A combination therapeutic agent comprising acompound of formula (I) and an additional active ingredient, wherein thecompound of formula (I) is:

wherein R¹ is H, a saturated or unsaturated, branched or unbranchedC₁₋₁₅ alkyl chain, wherein optionally one or more carbons is/arereplaced by a heteroatom selected from O, N, S(O)_(p), wherein saidchain is optionally substituted by one or more groups independentlyselected from oxo, halogen, an aryl group, a heteroaryl group, acarbocyclyl group or a heterocyclyl group, each aryl, heteroaryl,carbocyclyl or heterocyclyl group bearing: 0 to 3 substituents selectedfrom halogen, -hydroxyl, —C₁₋₆ alkyl, —C₁₋₆ alkoxy, —C₂₋₃ alkoxyOC₁₋₃alkyl, —C₂₋₃ alkylOC₁₋₃ alkyl, —C₁₋₃ hydroxyalkyl, —C₁₋₆ haloalkyl,amino, —C₁₋₄ mono or —C₂₋₈ di-alkyl amino, —C₁₋₄ mono or —C₂₋₈ di-acylamino, —C₀₋₆ alkylS(O)_(p)C₁₋₆ alkyl, —C₀₋₆ alkylS(O)_(p)NR⁶R⁷, —C₀₋₆alkylNR⁸C₀₋₆alkylS(O)_(p)C₁₋₆ alkyl, —C₀₋₆ alkylC(O)OC₀₋₆ alkyl,—NR⁸C₀₋₆ alkylC(O)NR⁶R⁷, —NR⁸C₀₋₆ alkylC(O)C₀₋₆ alkyl, —C₀₋₆alkylC(O)NR⁶R⁷, and —C₀₋₆ alkylC(O)C₁₋₆ alkyl; and/or one aryl,heterocyclyl or carbocyclyl; X is C₆₋₁₀ aryl or a C₅₋₉ heteroaryl eachsubstituted by R^(2a) and by R^(2b) wherein R^(2a) is selected fromhydrogen, —C₁₋₃ alkyl, halo, hydroxyl, cyano, —C₁₋₃ haloalkyl, —C₁₋₃alkoxy, —C₂₋₃ alkoxyOC₁₋₃ alkyl, —C₂₋₃ alkylOC₁₋₃ alkyl, —C₁₋₃hydroxyalkyl, —C₀₋₆ alkylS(O)_(q)C₁₋₃ alkyl, —C₀₋₆ alkylS(O)_(p)NR⁶R⁷,—C₀₋₆ alkylNR⁸C₀₋₆alkylS(O)_(p)C₁₋₆ alkyl, —C₀₋₆ alkylC(O)OH, —C₀₋₆alkylC(O)OC₁₋₆ alkyl, —NR⁸C₀₋₆ alkylC(O)NR⁶R⁷, —NR⁸C₀₋₆ alkylC(O)C₁₋₆alkyl, —C₀₋₆ alkylC(O)NR⁶R⁷ and —C₀₋₆ alkylC(O)C₁₋₆ alkyl; and R^(2b) isselected from hydrogen, C₁₋₃ alkyl, halo, hydroxyl, cyano, —C₁₋₃haloalkyl, —C₁₋₃ alkoxy, and —C₀₋₆ alkylS(O)_(q)C₁₋₃ alkyl; R^(3a) ishydroxyl; R^(3b) is selected from hydrogen, hydroxyl, halo, cyano, —C₁₋₃haloalkyl, —C₁₋₃ hydroxyalkyl, —C₁₋₃ alkoxy, and —S(O)_(q)C₁₋₃ alkyl; R⁴is hydrogen or —C₁₋₃ alkyl; R⁵ is hydrogen or —C₁₋₃ alkyl; R⁶ ishydrogen or —C₁₋₆ alkyl; R⁷ is hydrogen or —C₁₋₆ alkyl; R⁸ is hydrogenor —C₁₋₆ alkyl; p is 0 or an integer 1 or 2; q is 0 or an integer 1 or 2or a pharmaceutically acceptable salt thereof, including allstereoisomers, tautomers and isotopic derivatives thereof.
 24. Thecombination therapeutic agent of claim 23 wherein, in the compound offormula (I): R¹ is H, a saturated or unsaturated, branched or unbranchedC₁₋₁₀ alkyl chain, wherein optionally one or more carbons is/arereplaced by a heteroatom selected from O, N, S(O)_(p), wherein saidchain is optionally substituted by one or more groups independentlyselected from oxo, halogen, an aryl group, a heteroaryl group, acarbocyclyl group or a heterocyclyl group, each aryl, heteroaryl,carbocyclyl or heterocyclyl group bearing: 0 to 3 substituents selectedfrom halogen, —C₁₋₆ alkyl, —C₁₋₆ alkoxy, —C₂₋₃ alkoxyOC₁₋₃ alkyl, —C₁₋₆haloalkyl, amino, —C₁₋₄ mono or —C₂₋₈ di-alkyl amino, —C₁₋₄ mono or—C₂₋₈ di-acyl amino, —C₀₋₆ alkylS(O)_(p)C₁₋₆ alkyl, —C₀₋₆alkylS(O)_(p)NR⁶R⁷, —C₀₋₆ alkylNR⁸C₀₋₆alkylS(O)_(p)C₁₋₆ alkyl, —C₀₋₆alkylC(O)OC₀₋₆ alkyl, —NC₀₋₆ alkylC(O)NR⁶R⁷—NC₀₋₆ alkylC(O)C₀₋₆ alkyl,—C₀₋₆ alkylC(O)NR⁶R⁷, and —C₀₋₆ alkylC(O)C₁₋₆ alkyl; and/or one aryl,heterocyclyl or carbocyclyl; X is C₆₋₁₀ aryl or a C₅₋₉ heteroaryl eachsubstituted by R^(2a) and optionally by R^(2b) wherein R^(2a) isselected from hydrogen, —C₁₋₃ alkyl, halo, hydroxyl, cyano, —C₁₋₃haloalkyl, —C₁₋₃ alkoxy, —C₂₋₃ alkoxyOC₁₋₃ alkyl, —C₁₋₃ hydroxyalkyl,—C₀₋₆ alkylS(O)_(q)C₁₋₃ alkyl, —C₀₋₆ alkylS(O)_(p)NR⁶R⁷, —C₀₋₆alkylNR⁸C₀₋₆alkylS(O)_(p)C₁₋₆ alkyl, —C₀₋₆ alkylC(O)OH, —C₀₋₆alkylC(O)OC₁₋₆ alkyl, —NC₀₋₆ alkylC(O)NR⁶R⁷, —NR⁸C₀₋₆ alkylC(O)C₁₋₆alkyl, —C₀₋₆ alkylC(O)NR⁶R⁷ and —C₀₋₆ alkylC(O)C₁₋₆ alkyl; and R^(2b) isselected from hydrogen, C₁₋₃ alkyl, halo, cyano, —C₁₋₃ haloalkyl, —C₁₋₃alkoxy and —C₀₋₆ alkylS(O)_(q)C₁₋₃ alkyl; R^(3a) is hydroxyl; R^(3b) ishydrogen, hydroxyl, halo, cyano, —C₁₋₃ haloalkyl, —C₁₋₃ hydroxyalkyl,—C₁₋₃ alkoxy, —S(O)_(q)C₁₋₃ alkyl; R⁴ is hydrogen or —C₁₋₃ alkyl; R⁵ ishydrogen or —C₁₋₃ alkyl; R⁶ is hydrogen or —C₁₋₆ alkyl; R⁷ is hydrogenor —C₁₋₆ alkyl; R⁸ is hydrogen or —C₁₋₆ alkyl p is 0 or an integer 1 or2; q is 0 or an integer 1 or 2 or a pharmaceutically acceptable saltthereof, including all stereoisomers, tautomers and isotopic derivativesthereof.
 25. The combination therapeutic agent of claim 23 wherein, inthe compound of formula (I), R¹ is hydrogen.
 26. The combinationtherapeutic agent of claim 23 wherein, in the compound of formula (I),R¹ is:


27. The combination therapeutic agent of claim 23 wherein, in thecompound of formula (I), R¹ is —CH₂CH₂CH₂C(O)OH.
 28. The combinationtherapeutic agent of claim 23 wherein, in the compound of formula (I),R¹ is —CH₂OCH₂CH₂OCH₂CH₂OCH₃.
 29. The combination therapeutic agent ofclaim 23 wherein, in the compound of formula (I), R¹ is—CH₂CH₂CH₂C(O)N(CH₂CH₂OCH₃)₂.
 30. The combination therapeutic agent ofclaim 23 wherein, in the compound of formula (I), R^(2a) is selectedfrom the group comprising chloro, fluoro, cyano, methoxy,trifluoromethyl and SO₂CH₃.
 31. The combination therapeutic agent ofclaim 23 wherein, in the compound of formula (I), R⁴ is hydrogen. 32.The combination therapeutic agent of claim 23 wherein, in the compoundof formula (I), R⁵ is hydrogen.
 33. The combination therapeutic agent ofclaim 23 wherein, in the compound of formula (I), R³ is in the metaposition.
 34. The combination therapeutic agent of claim 23 wherein, inthe compound of formula (I), R³ is in the para position.
 35. Thecombination therapeutic agent of claim 23 wherein the compound offormula (I) is selected from:2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-ethynylquinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(3-(2-(2-methoxyethoxy)ethoxy)prop-1-yn-1-yl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)hex-5-ynoicacid;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;3-((2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-(3-(2-(2-hydroxyethoxy)ethoxy)prop-1-yn-1-yl)-4-oxoquinazolin-3(4H)-yl)methyl)benzonitrile;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(3-(2-morpholinoethoxy)prop-1-ynyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-ethynylquinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(3-chlorobenzyl)-5-ethynylquinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(3-chlorobenzyl)-5-ethynylquinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(2-fluorobenzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(2-fluorobenzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(3-methoxybenzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(3-methoxybenzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(3-(trifluoromethyl)benzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(3-(trifluoromethyl)benzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(4-chlorobenzyl)-5-ethynylquinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(4-(methylsulfonyl)benzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(4-(methylsulfonyl)benzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(4-(trifluoromethyl)benzyl)quinazolin-4(3H)-one;3-((2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-4-oxoquinazolin-3(4H)-yl)methyl)benzonitrile;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(3-(methylsulfonyl)benzyl)quinazolin-4(3H)-one;3-((2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-4-oxoquinazolin-3(4H)-yl)methyl)benzonitrile;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(4-chlorobenzyl)-5-ethynylquinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(4-chlorobenzyl)-5-(3-methoxyprop-1-ynyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(3-methoxybenzyl)-5-(3-methoxyprop-1-ynyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(3-methoxyprop-1-ynyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(4-(trifluoromethyl)benzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(3-(2-methoxyethoxy)prop-1-ynyl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-((5-methylisoxazol-3-yl)methyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-((5-methylisoxazol-3-yl)methyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(3-chloro-2-fluorobenzyl)-5-ethynylquinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2,6-difluorobenzyl)-5-ethynylquinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(4-chloro-2-fluorobenzyl)-5-ethynylquinazolin-4(3H)-one;2-((4-Amino-3-(3-fluoro-4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-ethynylquinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-(3-methoxyprop-1-ynyl)-3-(3-(trifluoromethyl)benzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(4-fluorobenzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(3-cyclopentylprop-1-ynyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-(3-(benzyloxy)prop-1-ynyl)-3-(2-chlorobenzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(5-hydroxypent-1-ynyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(2-fluoro-5-methoxybenzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(3,4-dichlorobenzyl)-5-ethynylquinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-benzyl-5-ethynylquinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(2-trifluoromethylbenzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(4-methoxybenzyl)quinazolin-4(3H)-one;4-((2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-4-oxoquinazolin-3(4H)-yl)methyl)benzonitrile;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(2-fluoro-4-methoxybenzyl)quinazolin-4(3H)-one;1-(3-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)prop-2-ynyl)urea;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-fluorobenzyl)-5-(3-(2-(2-methoxyethoxy)ethoxy)prop-1-ynyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-fluoro-3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-ethynylquinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(3-phenoxyprop-1-ynyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-fluorobenzyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;6-(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(2-methoxyethyl)hex-5-ynamide;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(7-morpholino-7-oxohept-1-yn-1-yl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(5-morpholino-5-oxopent-1-yn-1-yl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-((5-methylpyrazin-2-yl)methyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-oxo-6-(piperidin-1-yl)hex-1-yn-1-yl)quinazolin-4(3H)-one;6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N,N-diethylhex-5-ynamide;7-(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)hept-6-ynoicacid;2-Acetamido-N-(3-(2-((4-amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)prop-2-yn-1-yl)acetamide;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(3-methoxy-5-(trifluoromethyl)benzyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-methoxyphenethyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(benzo[b]thiophen-2-ylmethyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-fluoro-3-methoxybenzyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;Methyl3-((2-((4-amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)-4-oxoquinazolin-3(411)-yl)methyl)benzoate;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-((1-methyl-1H-pyrazol-4-yl)methyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(benzofuran-5-ylmethyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-((2-methylthiazol-4-yl)methyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-(4-methylpiperazin-1-yl)-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-(4-morpholinopiperidin-1-yl)-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;5-(6-(4-Acetylpiperazin-1-yl)-6-oxohex-1-yn-1-yl)-2-((4-amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)quinazolin-4(3H)-one;N-(4-(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)but-3-yn-1-yl)morpholine-4-carboxamide;5-(6-(4-Acetylpiperazin-1-yl)-6-oxohex-1-yn-1-yl)-2-((4-amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)quinazolin-4(3H)-one;N-(4-(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)but-3-yn-1-yl)morpholine-4-carboxamide;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-(5-(bis(2-methoxyethy)amino)pent-1-ynyl)-3-(2-chlorobenzyl)quinazolin-4(3H)-one;6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-cyclopentylhex-5-ynamide;6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(tetrahydro-2H-pyran-4-yl)hex-5-ynamide;6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(2-morpholinoethyl)hex-5-ynamide;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-(4-(2-methoxyethyl)piperazin-1-yl)-6-oxohex-1-ynyl)quinazolin-4(3H)-one;6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(2-(dimethylamino)ethyl)hex-5-ynamide;6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(pyridin-4-yl)hex-5-ynamide;6-(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(pyridin-4-yl)hex-5-ynamide;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-(4-(dimethylamino)piperidin-1-yl)-6-oxohex-1-ynyl)quinazolin-4(3H)-one;6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N,N-bis(2-methoxyethyl)hex-5-ynamide;6-(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N,N-bis(2-methoxyethyl)hex-5-ynamide;6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(2-(4-methylpiperazin-1-yl)ethyl)hex-5-ynamide;6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-methyl-N-(2-(4-methylpiperazin-1-yl)ethyl)hex-5-ynamide;6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-isopropylhex-5-ynamide;6-(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-isopropylhex-5-ynamide;6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N,N-dimethylhex-5-ynamide;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-oxo-6-(pyrrolidin-1-yl)hex-1-yn-1-yl)quinazolin-4(3H)-one;6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(pyrrolidin-3-yl)hex-5-ynamide;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-(3-(dimethylamino)pyrrolidin-1-yl)-6-oxohex-1-ynyl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-(3-(dimethylamino)pyrrolidin-1-yl)-6-oxohex-1-ynyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-(4-methyl-1,4-diazepan-1-yl)-6-oxohex-1-ynyl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-(4-methyl-1,4-diazepan-1-yl)-6-oxohex-1-ynyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxy-3-methoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-morpholino-6-oxohex-1-ynyl)quinazolin-4(3H)-one;or a pharmaceutically acceptable salt thereof, including allstereoisomers, tautomers and isotopic derivatives thereof.
 36. Thecombination therapeutic agent of claim 23, wherein the additional activeingredient is selected from the group consisting of steroids, betaagonists, xanthines, muscarinic antagonists and p38 MAP kinaseinhibitors.
 37. The combination therapeutic agent of claim 36, whereinthe steroid is selected from the group consisting of budesonide,beclomethasone dipropionate, fluticasone propionate, mometasone furoateand fluticasone furoate.
 38. The combination therapeutic agent of claim36, wherein the beta agonist is selected from the group consisting ofterbutaline, salbutamol, salmeterol, formoterol and indacaterol.
 39. Thecombination therapeutic agent of claim 36, wherein the xanthine istheophylline.
 40. The combination therapeutic agent of claim 36, whereinthe muscarinic antagonist is ipratropium.
 41. The combinationtherapeutic agent of claim 23, wherein the additional active ingredientis an antiviral agent.
 42. The combination therapeutic agent of claim41, wherein the antiviral agent is selected from the group consisting ofacyclovir, tamiflu, relenza and interferon.
 43. The combinationtherapeutic agent of claim 23, wherein the compound of formula (I) andthe additional active ingredient are co-formulated.
 44. The combinationtherapeutic agent of claim 23, wherein the compound of formula (I) andthe additional active ingredient are co-administered.
 45. A method forthe treatment of a respiratory disorder comprising administering to apatient in need of such treatment an effective amount of the combinationtherapeutic agent of claim
 36. 46. A method for the treatment of viralexacerbations of asthma and/or COPD, flu virus, rhinovirus and/orrespiratory syncytial virus comprising administering to a patient inneed of such treatment an effective amount of the combinationtherapeutic agent of claim
 41. 47. A process for the preparation of acompound of formula (I)

wherein R¹ is H, a saturated or unsaturated, branched or unbranchedC₁₋₁₅ alkyl chain, wherein optionally one or more carbons is/arereplaced by a heteroatom selected from O, N, S(O)_(p), wherein saidchain is optionally substituted by one or more groups independentlyselected from oxo, halogen, an aryl group, a heteroaryl group, acarbocyclyl group or a heterocyclyl group, each aryl, heteroaryl,carbocyclyl or heterocyclyl group bearing: 0 to 3 substituents selectedfrom halogen, -hydroxyl, —C₁₋₆ alkyl, —C₁₋₆ alkoxy, —C₂₋₃ alkoxyOC₁₋₃alkyl, —C₂₋₃ alkylOC₁₋₃ alkyl, —C₁₋₃ hydroxyalkyl, —C₁₋₆ haloalkyl,amino, —C₁₋₄ mono or —C₂₋₈ di-alkyl amino, —C₁₋₄ mono or —C₂₋₈ di-acylamino, —C₀₋₆ alkylS(O)_(p)C₁₋₆ alkyl, —C₀₋₆ alkylS(O)_(p)NR⁶R⁷, —C₀₋₆alkylNR⁸C₀₋₆alkylS(O)_(p)C₁₋₆ alkyl, —C₀₋₆ alkylC(O)OC₀₋₆ alkyl,—NR⁸C₀₋₆ alkylC(O)NR⁶R⁷, —NR⁸C₀₋₆ alkylC(O)C₀₋₆ alkyl, —C₀₋₆alkylC(O)NR⁶R⁷, and —C₀₋₆ alkylC(O)C₁₋₆ alkyl; and/or one aryl,heterocyclyl or carbocyclyl; X is C₆₋₁₀ aryl or a C₅₋₉ heteroaryl eachsubstituted by R^(2a) and by R^(2b) wherein R^(2a) is selected fromhydrogen, —C₁₋₃ alkyl, halo, hydroxyl, cyano, —C₁₋₃ haloalkyl, —C₁₋₃alkoxy, —C₂₋₃ alkoxyOC₁₋₃ alkyl, —C₂₋₃ alkylOC₁₋₃ alkyl, —C₁₋₃hydroxyalkyl, —C₀₋₆ alkylS(O)_(q)C₁₋₃ alkyl, —C₀₋₆ alkylS(O)_(p)NR⁶R⁷,—C₀₋₆ alkylNR⁸C₀₋₆alkylS(O)_(p)C₁₋₆ alkyl, —C₀₋₆ alkylC(O)OH, —C₀₋₆alkylC(O)OC₁₋₆ alkyl, —NR⁸C₀₋₆ alkylC(O)NR⁶R⁷, —NR⁸C₀₋₆ alkylC(O)C₁₋₆alkyl, —C₀₋₆ alkylC(O)NR⁶R⁷ and —C₀₋₆ alkylC(O)C₁₋₆ alkyl; and R^(2b) isselected from hydrogen, C₁₋₃ alkyl, halo, hydroxyl, cyano, —C₁₋₃haloalkyl, —C₁₋₃ alkoxy, and —C₀₋₆ alkylS(O)_(q)C₁₋₃ alkyl; R^(3a) ishydroxyl; R^(3b) is selected from hydrogen, hydroxyl, halo, cyano, —C₁₋₃haloalkyl, —C₁₋₃ hydroxyalkyl, —C₁₋₃ alkoxy, and —S(O)_(q)C₁₋₃ alkyl; R⁴is hydrogen or —C₁₋₃ alkyl; R⁵ is hydrogen or —C₁₋₃ alkyl; R⁶ ishydrogen or —C₁₋₆ alkyl; R⁷ is hydrogen or —C₁₋₆ alkyl; R⁸ is hydrogenor —C₁₋₆ alkyl; p is 0 or an integer 1 or 2; q is 0 or an integer 1 or 2or a pharmaceutically acceptable salt thereof, including allstereoisomers, tautomers and isotopic derivatives thereof; comprisingreacting a compound of formula (II):

or a protected derivate thereof wherein X, R^(3a), R^(3b), R⁴ and R⁵ areas defined above for compounds of formula (I) and LG₁ represents aleaving group, with a compound of formula (III):≡—R¹   (III) or a protected derivative thereof, wherein R¹ is as definedabove for compounds of formula (I), in the presence of a suitablecatalyst, an organic base and a polar aprotic solvent, under an inertatmosphere; and optionally deprotecting to reveal a compound of formula(I); and optionally converting one compound of formula (I) into anothercompound of formula (I) by standard functional group transformations.48. The process of claim 47 wherein, in the compound of formula (I): R¹is H, a saturated or unsaturated, branched or unbranched C₁₋₁₀ alkylchain, wherein optionally one or more carbons is/are replaced by aheteroatom selected from O, N, S(O)_(p), wherein said chain isoptionally substituted by one or more groups independently selected fromoxo, halogen, an aryl group, a heteroaryl group, a carbocyclyl group ora heterocyclyl group, each aryl, heteroaryl, carbocyclyl or heterocyclylgroup bearing: 0 to 3 substituents selected from halogen, —C₁₋₆ alkyl,—C₁₋₆ alkoxy, —C₂₋₃ alkoxyOC₁₋₃ alkyl, —C₁₋₆ haloalkyl, amino, —C₁₋₄mono or —C₂₋₈ di-alkyl amino, —C₁₋₄ mono or —C₂₋₈ di-acyl amino, —C₀₋₆alkylS(O)_(p)C₁₋₆ alkyl, —C₀₋₆ alkylS(O)_(p)NR⁶R⁷, —C₀₋₆alkylNR⁸C₀₋₆alkylS(O)_(p)C₁₋₆ alkyl, —C₀₋₆ alkylC(O)OC₀₋₆ alkyl, —NC₀₋₆alkylC(O)NR⁶R⁷—NC₀₋₆ alkylC(O)C₀₋₆ alkyl, —C₀₋₆ alkylC(O)NR⁶R⁷, and—C₀₋₆ alkylC(O)C₁₋₆ alkyl; and/or one aryl, heterocyclyl or carbocyclyl;X is C₆₋₁₀ aryl or a C₅₋₉ heteroaryl each substituted by R^(2a) andoptionally by R^(2b) wherein R^(2a) is selected from hydrogen, —C₁₋₃alkyl, halo, hydroxyl, cyano, —C₁₋₃ haloalkyl, —C₁₋₃ alkoxy, —C₂₋₃alkoxyOC₁₋₃ alkyl, —C₁₋₃ hydroxyalkyl, —C₀₋₆ alkylS(O)_(q)C₁₋₃ alkyl,—C₀₋₆ alkylS(O)_(p)NR⁶R⁷, —C₀₋₆ alkylNR⁸C₀₋₆alkylS(O)_(p)C₁₋₆ alkyl,—C₀₋₆ alkylC(O)OH, —C₀₋₆ alkylC(O)OC₁₋₆ alkyl, —NC₀₋₆ alkylC(O)NR⁶R⁷,—NR⁸C₀₋₆ alkylC(O)C₁₋₆ alkyl, —C₀₋₆ alkylC(O)NR⁶R⁷ and —C₀₋₆alkylC(O)C₁₋₆ alkyl; and R^(2b) is selected from hydrogen, C₁₋₃ alkyl,halo, cyano, —C₁₋₃ haloalkyl, —C₁₋₃ alkoxy and —C₀₋₆ alkylS(O)_(q)C₁₋₃alkyl; R^(3a) is hydroxyl; R^(3b) is hydrogen, hydroxyl, halo, cyano,—C₁₋₃ haloalkyl, —C₁₋₃ hydroxyalkyl, —C₁₋₃ alkoxy, —S(O)_(q)C₁₋₃ alkyl;R⁴ is hydrogen or —C₁₋₃ alkyl; R⁵ is hydrogen or —C₁₋₃ alkyl; R⁶ ishydrogen or —C₁₋₆ alkyl; R⁷ is hydrogen or —C₁₋₆ alkyl; R⁸ is hydrogenor —C₁₋₆ alkyl p is 0 or an integer 1 or 2; q is 0 or an integer 1 or 2or a pharmaceutically acceptable salt thereof, including allstereoisomers, tautomers and isotopic derivatives thereof.
 49. Theprocess of claim 47 wherein, in the compound of formula (I), R¹ ishydrogen.
 50. The process of claim 47 wherein, in the compound offormula (I), R¹ is:


51. The process of claim 47 wherein, in the compound of formula (I), R¹is CH₂CH₂CH₂C(O)OH.
 52. The process of claim 47 wherein, in the compoundof formula (I), R¹ is CH₂OCH₂CH₂OCH₂CH₂OCH₃.
 53. The process of claim 47wherein, in the compound of formula (I), R¹ isCH₂CH₂CH₂C(O)N(CH₂CH₂OCH₃)₂.
 54. The process of claim 47 wherein, in thecompound of formula (I), R^(2a) is selected from the group comprisingchloro, fluoro, cyano, methoxy, trifluoromethyl and SO₂CH₃.
 55. Theprocess of claim 47 wherein, in the compound of formula (I), R⁴ ishydrogen.
 56. The process of claim 47 wherein, in the compound offormula (I), R⁵ is hydrogen.
 57. The process of claim 47 wherein, in thecompound of formula (I), R³ is in the meta position.
 58. The process ofclaim 47 wherein, in the compound of formula (I), R³ is in the paraposition.
 59. The process of claim 47 wherein the compound of formula(I) is selected from:2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-ethynylquinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(3-(2-(2-methoxyethoxy)ethoxy)prop-1-yn-1-yl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)hex-5-ynoicacid;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;3-((2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-(3-(2-(2-hydroxyethoxy)ethoxy)prop-1-yn-1-yl)-4-oxoquinazolin-3(4H)-yl)methyl)benzonitrile;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(3-(2-morpholinoethoxy)prop-1-ynyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-ethynylquinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(3-chlorobenzyl)-5-ethynylquinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(3-chlorobenzyl)-5-ethynylquinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(2-fluorobenzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(2-fluorobenzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(3-methoxybenzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(3-methoxybenzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(3-(trifluoromethyl)benzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(3-(trifluoromethyl)benzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(4-chlorobenzyl)-5-ethynylquinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(4-(methylsulfonyl)benzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(4-(methylsulfonyl)benzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(4-(trifluoromethyl)benzyl)quinazolin-4(3H)-one;3-((2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-4-oxoquinazolin-3(4H)-yl)methyl)benzonitrile;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(3-(methylsulfonyl)benzyl)quinazolin-4(3H)-one;3-((2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-4-oxoquinazolin-3(4H)-yl)methyl)benzonitrile;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(4-chlorobenzyl)-5-ethynylquinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(4-chlorobenzyl)-5-(3-methoxyprop-1-ynyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(3-methoxybenzyl)-5-(3-methoxyprop-1-ynyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(3-methoxyprop-1-ynyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(4-(trifluoromethyl)benzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(3-(2-methoxyethoxy)prop-1-ynyl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-((5-methylisoxazol-3-yl)methyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-((5-methylisoxazol-3-yl)methyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(3-chloro-2-fluorobenzyl)-5-ethynylquinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2,6-difluorobenzyl)-5-ethynylquinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(4-chloro-2-fluorobenzyl)-5-ethynylquinazolin-4(3H)-one;2-((4-Amino-3-(3-fluoro-4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-ethynylquinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-(3-methoxyprop-1-ynyl)-3-(3-(trifluoromethyl)benzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(4-fluorobenzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(3-cyclopentylprop-1-ynyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-(3-(benzyloxy)prop-1-ynyl)-3-(2-chlorobenzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(5-hydroxypent-1-ynyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(2-fluoro-5-methoxybenzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(3,4-dichlorobenzyl)-5-ethynylquinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-benzyl-5-ethynylquinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(2-trifluoromethylbenzyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(4-methoxybenzyl)quinazolin-4(3H)-one;4-((2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-4-oxoquinazolin-3(4H)-yl)methyl)benzonitrile;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-ethynyl-3-(2-fluoro-4-methoxybenzyl)quinazolin-4(3H)-one;1-(3-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)prop-2-ynyl)urea;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-fluorobenzyl)-5-(3-(2-(2-methoxyethoxy)ethoxy)prop-1-ynyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-fluoro-3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-ethynylquinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(3-phenoxyprop-1-ynyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-fluorobenzyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;6-(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(2-methoxyethyl)hex-5-ynamide;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(7-morpholino-7-oxohept-1-yn-1-yl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(5-morpholino-5-oxopent-1-yn-1-yl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-((5-methylpyrazin-2-yl)methyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-oxo-6-(piperidin-1-yl)hex-1-yn-1-yl)quinazolin-4(3H)-one;6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N,N-diethylhex-5-ynamide;7-(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)hept-6-ynoicacid;2-Acetamido-N-(3-(2-((4-amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)prop-2-yn-1-yl)acetamide;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(3-methoxy-5-(trifluoromethyl)benzyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-methoxyphenethyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(benzo[b]thiophen-2-ylmethyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-fluoro-3-methoxybenzyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;Methyl3-((2-((4-amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)-4-oxoquinazolin-3(4H)-yl)methyl)benzoate;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-((1-methyl-1H-pyrazol-4-yl)methyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(benzofuran-5-ylmethyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-((2-methylthiazol-4-yl)methyl)-5-(6-morpholino-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-(4-methylpiperazin-1-yl)-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-(4-morpholinopiperidin-1-yl)-6-oxohex-1-yn-1-yl)quinazolin-4(3H)-one;5-(6-(4-Acetylpiperazin-1-yl)-6-oxohex-1-yn-1-yl)-2-((4-amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)quinazolin-4(3H)-one;N-(4-(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)but-3-yn-1-yl)morpholine-4-carboxamide;5-(6-(4-Acetylpiperazin-1-yl)-6-oxohex-1-yn-1-yl)-2-((4-amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)quinazolin-4(3H)-one;N-(4-(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)but-3-yn-1-yl)morpholine-4-carboxamide;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-5-(5-(bis(2-methoxyethy)amino)pent-1-ynyl)-3-(2-chlorobenzyl)quinazolin-4(3H)-one;6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-cyclopentylhex-5-ynamide;6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(tetrahydro-2H-pyran-4-yl)hex-5-ynamide;6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(2-morpholinoethyl)hex-5-ynamide;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-(4-(2-methoxyethyl)piperazin-1-yl)-6-oxohex-1-ynyl)quinazolin-4(3H)-one;6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(2-(dimethylamino)ethyl)hex-5-ynamide;6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(pyridin-4-yl)hex-5-ynamide;6-(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(pyridin-4-yl)hex-5-ynamide;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-(4-(dimethylamino)piperidin-1-yl)-6-oxohex-1-ynyl)quinazolin-4(3H)-one;6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N,N-bis(2-methoxyethyl)hex-5-ynamide;6-(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N,N-bis(2-methoxyethyl)hex-5-ynamide;6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(2-(4-methylpiperazin-1-yl)ethyl)hex-5-ynamide;6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-methyl-N-(2-(4-methylpiperazin-1-yl)ethyl)hex-5-ynamide;6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-isopropylhex-5-ynamide;6-(2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-isopropylhex-5-ynamide;6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N,N-dimethylhex-5-ynamide;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-oxo-6-(pyrrolidin-1-yl)hex-1-yn-1-yl)quinazolin-4(3H)-one;6-(2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-4-oxo-3,4-dihydroquinazolin-5-yl)-N-(pyrrolidin-3-yl)hex-5-ynamide;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-(3-(dimethylamino)pyrrolidin-1-yl)-6-oxohex-1-ynyl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-(3-(dimethylamino)pyrrolidin-1-yl)-6-oxohex-1-ynyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-(4-methyl-1,4-diazepan-1-yl)-6-oxohex-1-ynyl)quinazolin-4(3H)-one;2-((4-Amino-3-(3-hydroxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-(4-methyl-1,4-diazepan-1-yl)-6-oxohex-1-ynyl)quinazolin-4(3H)-one;2-((4-Amino-3-(4-hydroxy-3-methoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)-3-(2-chlorobenzyl)-5-(6-morpholino-6-oxohex-1-ynyl)quinazolin-4(3H)-one;or a pharmaceutically acceptable salt thereof, including allstereoisomers, tautomers and isotopic derivatives thereof.
 60. Theprocess of claim 47, wherein LG₁ is halo.
 61. The process of claim 47,wherein the catalyst is a palladium catalyst.
 62. The process of claim60, wherein the catalyst is bis(triphenylphosphine)palladium (II)dichloride, in the presence of copper iodide.
 63. The process of claim47, further including a preceding step of preparing the compound offormula (II) by reacting a compound of of formula (IV):

or a protected derivative thereof, wherein LG₁ and X are as definedabove for compounds of formula (II) and LG₂ is a leaving group, with acompound of formula (V):

or a protected derivative thereof, wherein R^(3a), R^(3b), R⁴ and R⁵ areas defined above for compounds of formula (I), in the presence of abase, in a polar aprotic solvent.
 64. The process of claim 63 whereinLG₂ is halo.
 65. The process of claim 63, wherein, in the compound offormula (V), R^(3a) is hydroxyl protected by a silyl ether protectinggroup.